Bunk LedgerCB radios for highway trucks (2026)
On a US highway the radio people mean is an ordinary CB: 40 channels, about 4 watts, no license application. Uniden's PRO505XL manual says US users no longer apply for a license and that you still have to follow the CB rules. This page is not those rules, and it is not a guide to modified "export" radios or linear amplifiers. Those are a different, worse idea. They interfere with people who are trying to hear a brake check. Buy a stock 40-channel radio.
Channel 19 is the channel drivers customarily use for highway traffic. Channel 9 is the emergency channel both radios below call out on the front panel or in the feature list. Custom is not a promise that anyone is listening.
The antenna is the purchase
A 4 W radio into a bad antenna is a 4 W radio you cannot hear. Both sets below use a standard SO-239 antenna jack. The differences that change your day are the mount and the match, not a secret chip.
- A magnet mount comes off at the end of a lease and does not ask you to drill. It also needs a steel roof, and it is a theft target at a truck stop if you leave it up.
- A mirror mount avoids a hole in the roof and still needs a solid ground and a coax run that is not crushed in the door.
- A permanent mount is the cleanest and the one a company shop may forbid. Ask before you drill a fleet cab.
The Cobra 29 LX manual lists a built-in SWR calibration meter and an antenna warning. Follow that manual when you tune. If the meter says the antenna is poor, fix the mount, the ground, or the coax before you blame the radio. The Uniden PRO505XL spec sheet we used does not list an SWR meter. You would use an external meter, once, when you install the antenna. We are not walking through a tune-up procedure here. Use the sheet that came with the radio.
Uniden's manual also says the antenna must stay at least 16.92 inches (43 cm) from people, and that the radio itself should not sit in front of an airbag or block your view of the road. Those are the manual's instructions. Follow them.
LED light bars and a cheap inverter can raise the noise in the speaker. If the radio is quiet with the engine off and harsh with the accessories on, you are hunting interference, not a bigger radio. A noise blanker, which the Cobra manual lists, is a help. It is not a cure for a bad power connection.
Two stock radios
On a phone, this table moves sideways. The first column stays put.
| Radio | What the manual lists | Size and weight | What you give up | Not for |
|---|---|---|---|---|
| Cobra 29 LX | 40 CB channels, 4 W AM, NOAA weather, SWR meter, instant channel 9 and 19, noise blanker, RF gain. About 4 lb in that manual | A full-size dash radio. The manual's height fraction is easy to misread in scans, so measure the carton. Current Cobra page adds AM/FM talk | Dashboard space. A deeper install | A crowded overhead with no room for a 7-inch-wide face |
| Uniden PRO505XL | 40 AM channels, 4 W, instant channel 9, SO-239, 13.8 V, either ground if you are sure which you have | 4-7/8 in wide, 7-1/2 in deep, 1-3/4 in high. 1 lb 3 oz | No NOAA weather in the spec table. No built-in SWR meter. No instant 19 called out the way the Cobra manual does | Someone who wanted weather radio and an SWR meter in the same face |
Cobra 29 LX
The long-running 29 LX manual lists 40 channels from 26.965 to 27.405 MHz, 4 W AM, 10 NOAA weather channels, an SWR meter, instant 9 and 19, a noise blanker, RF gain, a PA jack, and a front 4-pin mic. Current draw in that manual is up to 1.5 A on transmit and about 0.3 A squelched on receive. That is a small electrical load next to a fridge or a coffee maker. It still wants a solid 12 V connection, not a dangling tap.
Cobra's current 29 LX product page describes dual-mode AM/FM as well. FM is useful only if the person you are talking to also has it. AM on 19 is still the highway habit. If the listing you are holding does not say AM/FM, do not assume the new feature is in that box. Weather alerts are the other reason people pick the full-size set: the manual describes a weather scan and an alert. Confirm those controls are on the unit you receive.
It is a large object in a modern dash that was not designed around a CB. Sit in the seat and look at the airbag covers before you pick a pocket. Uniden's warning about airbags applies to any radio, including this one.
Product page: Cobra 29 LX.
Uniden PRO505XL
Uniden's manual lists 40 AM channels, 4 W, a body 4-7/8 inches wide by 7-1/2 deep by 1-3/4 high, and a weight of 1 lb 3 oz. Transmit current is listed at 1.4 A full modulation. The mic is a plug-in electret. There is an external-speaker jack and a PA function. Instant channel 9 is the emergency shortcut the manual and the product descriptions agree on.
What the spec table does not give you is NOAA weather or a built-in SWR meter. If you drive routes where you actually use the weather receiver in the CB, this is the wrong compact radio. A phone does not fully replace that, because a phone needs a signal and a plan. It is, however, the radio that fits where a 29-series face will not.
The manual tells you to confirm positive or negative ground before you connect the leads, and not to guess. US trucks are negative ground as a rule. "As a rule" is not the same as the truck in front of you. If you are not sure, stop and ask someone who can meter it. Getting the leads backward is a good way to damage a radio that otherwise draws about an amp.
Manual: PRO505XL PDF.
Buy the antenna path first
- If you cannot mount an antenna, do not buy the radio yet.
- If you want weather receive and an SWR meter and you have the dash space, look at the current 29 LX and match the feature list on the carton to the one above.
- If the dash is full and you only need 40-channel AM, the PRO505XL's published size is the compact one. Plan on an external SWR check when you hang the antenna.
- Skip amplifiers and modified radios. Four watts and a decent antenna is the ordinary highway setup.
Along the way
Conclusion
Mount the antenna where the manual allows, not in front of an airbag, and confirm whether the truck is positive or negative ground before you wire anything.
FAQ
Does the current Cobra 29 LX page say AM only?
An older manual describes 4 watt AM. The current cobra.com page also says AM/FM. Read the page for the unit you are buying.
Does the PRO505XL include NOAA and an SWR meter?
Not in the spec table of the manual we used. It lists 40 AM channels, 4 watts, and instant channel 9.
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