360L is the name SiriusXM gives to the version of its service that reaches a vehicle by two routes at once: the satellite signal the company has broadcast to cars since the early 2000s, and an internet connection supplied by the vehicle's cellular modem. The satellite path carries the linear lineup to every equipped receiver at the same instant. The internet path carries the channels and on-demand programming that will not fit in the spectrum and, more consequentially for advertising, carries data back the other way.

That return path is why the platform matters to advertising. Satellite broadcast is one-way by construction: a receiver cannot tell the transmitter what it is doing, and a spot inserted into a national break plays identically in every car within the footprint. An internet protocol connection converts a broadcast device into something closer to a streaming client, capable of reporting listening and, in principle, of receiving a different advertisement from the vehicle parked beside it.

Two delivery paths in one receiver

The satellite side runs on fixed capacity. SiriusXM holds 35 MHz of contiguous licensed spectrum, and every broadcast channel occupies part of that allocation permanently, whether one subscriber is listening or none. Adding a channel means displacing another. The internet side carries no such constraint, which is why large blocks of programming can be added without touching the satellite lineup.

The split is visible in the channel numbering. Low numbers correspond to satellite feeds; streaming-only content, including the Xtra channels added to extend the catalogue beyond the broadcast lineup, sits in the higher ranges. SiriusXM's listener support material turns this into a diagnostic: subscribers are told to tune to channel 703 to confirm the streaming connection is live, since that channel exists only on the internet path.

Hardware determines eligibility. A 360L installation needs a head unit built for the interface and a telematics control unit whose modem carries audio traffic, not merely the low-bandwidth signalling used for remote start and diagnostics. Vehicles specified for telematics alone remain satellite-only regardless of software. The connection also enables over-the-air feature updates, individual listener profiles, voice search, and personalised artist stations built on Pandora technology, added for Ram vehicles in October 2020 on the Platinum plan.

Where the platform sits in the advertising stack

On the sell side, inventory is represented by SiriusXM Media and handled technically by AdsWizz, the ad tech subsidiary Pandora bought for $145 million and SiriusXM absorbed with Pandora. AdsWizz supplies dynamic ad insertion, programmatic guaranteed transactions and supply-side connectivity across the group's audio properties. Dynamic insertion decides which advertisement plays at request time rather than at production, the mechanism behind most United States podcast advertising revenue and the audio analogue of server-side stitching in video.

Applying that decisioning to a satellite break requires the internet path. The company calls the capability ad replacement: substituting a targeted spot into a linear break for one vehicle while the broadcast version continues elsewhere. That is what SiriusXM means by addressable in-car inventory, and it is why 360L penetration appears in earnings materials as an advertising metric.

On the buy side, programmatic access is strongest away from the dashboard. Amazon DSP gained access to the streaming portfolio through the AdsWizz supply-side platform on September 16, 2025, covering Pandora and SoundCloud rather than satellite breaks. The May 28, 2026 LiveRamp expansion brought RampID into streaming and podcast inventory, again outside the car.

Origin and evolution

SiriusXM and FCA US unveiled the platform on January 15, 2018 alongside the 2019 Ram 1500, the first vehicle to carry it. The launch configuration required the Uconnect 4C NAV system with a 12-inch display and an All Access subscription, delivered more than 200 channels, and supported over-the-air updates. The name refers to 360-degree listening rather than any technical specification.

Deployment was slow and OEM by OEM. Liberty Media's 2023 registration statement recorded the platform in roughly 110 vehicle models built for United States sale during 2022, and described the design intent plainly: combine the coverage and low delivery cost of satellite with the two-way capability of streaming, while giving SiriusXM data on how subscribers use the service. Subaru extended it across several model lines on April 9, 2024, and Volvo introduced it on the EX30 and EX90. In December 2024 it launched in Tesla and Rivian vehicles using a streaming-only implementation, passing two million vehicles quickly with no satellite receiver involved.

The advertising layer arrived separately. SiriusXM disclosed Free Access, its first free ad-supported tier, on the second quarter 2024 earnings call on August 1, 2024: 360L radios only, by invitation, one vehicle per customer, no app access, and permanent cancellation if unused for sixty days. SiriusXM Play followed in July 2025 at under $7 per month, aimed at nearly 100 million vehicles, promising enhanced targeting, dynamic ad insertion, channel takeover packages and measurement across 360L-enabled inventory.

Why the platform matters commercially

Audio carries a documented investment gap. Consumers give roughly 31% of their media time to audio while advertisers allocate about 9% of budgets, a 22-percentage-point disparity analysts attribute largely to measurement. The vehicle is the least instrumented part of that time. Scott Walker, SiriusXM's chief advertising revenue officer, put it plainly in July 2025: "The car is the final frontier for digital ad-supported media."

The scale figures show why the claim is plausible and why it remains unproven. SiriusXM counts a fleet of about 180 million enabled vehicles. Fourth quarter 2025 results put 360L in more than 50% of new enabled vehicles, standard on equipped Audis and newly present in the 2026 Toyota RAV4. Chief executive Jennifer Witz told analysts in April 2026 that roughly 55% of sales would carry it by year end, rising toward 70% among ramping automakers. She disclosed on July 30, 2026 that about 20% of self-pay subscribers were on 360L. Company investor material filed in 2024 projected roughly 65 million 360L vehicles in market by 2030, with addressable advertising capability on 40% of them.

The gap between new-vehicle penetration and installed base is not academic. The July 21, 2026 Audacy agreement split 42 local stations into nine reaching the full satellite base and 33 restricted to the app and 360L vehicles, creating two inventory tiers from launch with no subscriber counts published for either. The Sports Pass tier announced on July 29, 2026 carries the same caveat, and WWE Radio divides between satellite delivery that leaves no attribution trail and app listening that does.

Limitations and unresolved questions

The targeted advertising capability has slipped repeatedly. On the second quarter 2025 call the company pointed to ad replacement on 360L vehicles toward the end of that year. On October 30, 2025 executives moved it to early 2026, saying the change would make SiriusXM, in Radio Ink's account, "the only provider able to execute against addressable inventory in the car." On April 30, 2026 Witz told analysts that "we haven't yet unlocked real targeted ad capabilities inside 360L," describing it as work for later that year. Prepared remarks and analyst questions on July 30, 2026 covered YouTube, spectrum and subscriber quality; in-car addressability was not announced. As of September 2026 the capability remains prospective.

Structural constraints persist regardless of timing. Older receivers cannot be upgraded, so the addressable share of the fleet grows only at the speed of vehicle replacement. The dashboard is a constrained surface: a driver cannot click, and visual units cannot run while the vehicle is moving, a limit that also shapes in-car audio monetisation on general-purpose platforms and audio products delivered through factory infotainment. Reach and penetration figures are self-reported and have not been verified by an independent measurement body. The connection that enables addressability also collects listening data by design, stated in filings as a benefit and sitting alongside the wider privacy debate around connected vehicles.

Distinguishing 360L from adjacent terms

Hybrid radio is the general category: any dashboard system pairing a broadcast signal with an internet connection. Xperi's DTS AutoStage is the best-known independent example, joining terrestrial FM, DAB and HD Radio with IP-delivered metadata and station streams. 360L applies the same principle to a proprietary satellite service owned by one operator.

SiriusXM app streaming is internet-only listening on a phone or through smartphone projection. It reaches the car without being embedded in it, and its inventory is separate from the satellite lineup.

Free Access and SiriusXM Play are subscription packages depending on 360L hardware. They are commercial tiers, not the platform.

Addressable advertising is an outcome. 360L is infrastructure that could produce it, and as of September 2026 the two are not interchangeable.

Recent developments

The advertising story has so far been told mostly through inventory that never travels over satellite. Second quarter 2026 advertising revenue rose 5% to $454 million on podcasting and programmatic growth, with the April 22, 2026 YouTube audio representation agreement still pre-revenue and first quarter podcast advertising up 37%. Exclusive rights deals keep adding sellable content, and distribution keeps widening through video podcasts on Tubi and renewed AdsWizz sales exclusivities in Europe.

Inside the vehicle, the platform is currently sold to investors as an engagement and retention asset. Witz reported on July 30, 2026 that OEM subscribers average roughly 24 hours of listening per month, that those who also stream engage more than twice as much, and that listening through personalised artist stations rose 50% year on year. Competitors approach the same environment from the streaming side, with LiveOne's December 2025 DAX renewal built around connected vehicle inventory. What has not arrived is the thing the platform was described as enabling: a national radio break carrying a different advertisement in each car.

Timeline

  • January 15, 2018: SiriusXM and FCA US unveil SiriusXM with 360L alongside the 2019 Ram 1500
  • 2018: The 2019 Ram 1500 reaches buyers as the first vehicle offering the platform, on Uconnect 4C NAV with a 12-inch display
  • October 2020: Pandora-based personalised artist stations and sports notifications are added for Ram vehicles on the Platinum plan
  • 2022: The platform ships in approximately 110 vehicle models built for United States sale
  • April 9, 2024: Subaru extends 360L across 2023 and newer Ascent, Legacy and Outback models and 2024 Crosstrek, Impreza and WRX
  • August 1, 2024: SiriusXM discloses Free Access, an invitation-only free ad-supported tier restricted to 360L radios
  • December 2024: A streaming-only implementation launches in Tesla and Rivian vehicles, passing two million vehicles
  • July 15, 2025: SiriusXM Play launches at under $7 per month, with targeting, dynamic ad insertion and measurement promised for 360L inventory
  • October 2025: Toyota confirms 360L for the 2026 RAV4 and its next-generation Audio Multimedia system
  • October 30, 2025: Executives move addressable in-car ad replacement to an early 2026 rollout
  • February 2026: Fourth quarter 2025 results place 360L in more than 50% of new enabled vehicles across a 180 million vehicle fleet
  • April 30, 2026: Jennifer Witz says targeted advertising inside 360L has not yet been unlocked
  • June 2026: SXM-11 is launched, continuing the satellite replacement cycle
  • July 21, 2026: The Audacy agreement splits 42 stations between full satellite availability and 360L-and-app-only delivery
  • July 30, 2026: Second quarter 2026 results put about 20% of self-pay subscribers on 360L

Summary

Who. Sirius XM Holdings owns and operates the platform, with chief executive Jennifer Witz and chief advertising revenue officer Scott Walker setting its commercial direction. SiriusXM Media sells the inventory and the AdsWizz subsidiary supplies the ad serving and programmatic infrastructure. Automakers including Stellantis, Subaru, Volvo, Audi, Toyota, Tesla and Rivian control deployment through their infotainment and modem specifications.

What. 360L is a hybrid in-car receiver platform combining SiriusXM's one-way satellite broadcast with a two-way internet connection through the vehicle's cellular modem. It adds streaming-only channels, on-demand programming, personalisation and over-the-air updates, and it creates the return data path required for individually targeted advertising in a broadcast environment.

When. Unveiled on January 15, 2018 and first shipped in the 2019 Ram 1500, the platform reached roughly 110 vehicle models by 2022, more than 50% of new SiriusXM-enabled vehicles by the fourth quarter of 2025, and about 20% of self-pay subscribers by the second quarter of 2026. Commercial addressable in-car advertising, promised for late 2025 and then early 2026, had not launched as of September 2026.

Where. The platform operates in factory-installed infotainment systems in North American vehicles, in streaming-only form in Tesla and Rivian models, and nowhere outside the car. Its associated advertising inventory is transacted through SiriusXM Media and AdsWizz, with programmatic access currently concentrated in streaming and podcast supply rather than satellite breaks.

Why. Satellite radio delivers scale without addressability, and the vehicle remains the least measured part of a medium that takes 31% of consumer media time and 9% of advertising budgets. 360L is SiriusXM's mechanism for closing that gap by making in-car listening visible and individual advertisements substitutable, which is why penetration of the platform is now reported as an advertising metric even though the advertising capability itself is still pending.