CB or PMR radio – which works best off-road?

If you travel with several 4x4s, you know the situation: the lead vehicle has disappeared behind the crest, the one at the back is stuck in the mud – and of course there is no phone signal. Without radio, every convoy trip quickly becomes a test of patience. But which radio is the right one: CB or PMR? In this guide we explain the differences without the jargon – and why, for us, CB radio is the clear winner off-road.

Why radio at all?

With a radio, the lead driver can instantly say “Careful, deep rut on the left” – and everyone hears it at the same time. That makes your trip safer, more relaxed and saves a lot of time when a recovery is needed.

PMR446: the small handheld

You probably know PMR446: these are the handy walkie-talkies from the electronics store. They transmit at 446 MHz and can be used without registration or fees.

However, the German Federal Network Agency sets tight limits (document in German): a maximum of 0.5 watts radiated power, built-in antenna only and no use as a base station or repeater. An external antenna on the vehicle roof is therefore not allowed with PMR. For short distances – for example when guiding a driver through a tricky section – PMR is handy. For vehicle-to-vehicle communication it quickly reaches its limits, because the car body additionally shields the signal inside the cabin.

CB radio: the classic for vehicles

CB radio (“Citizens Band”) operates at around 27 MHz. Here too: you can use it without registration, without an exam and without fees. In Germany it is based on the general frequency assignment for CB radio by the Federal Network Agency (document in German).

In Germany you have 80 channels. Permitted are 4 watts on FM (channels 1–80) and AM (channels 1–40), and 12 watts PEP on SSB (channels 1–40). The key difference to PMR: a CB radio is permanently installed in the vehicle and used with an external antenna.

CB and PMR compared

	PMR446	CB radio
Frequency	446 MHz	approx. 27 MHz
Max. transmit power (Germany)	0.5 W ERP	4 W (FM/AM), 12 W PEP (SSB)
Antenna	built-in antenna only	external vehicle antenna possible
Installation	handheld	permanently installed, powered by the vehicle
Registration / fees	none	none
Typical use	short distances, guiding on foot	vehicle to vehicle, convoy

Why CB radio wins on 4x4 trips

• Antenna outside instead of a signal in a metal cage: the roof antenna sits outside the car body. In a convoy this gives clearly more range and better audio than a handheld inside the cabin.
• More power: up to 4 watts instead of 0.5 watts – perfectly legal.
• The waves get around terrain better: the longer waves at 27 MHz cope better with hills, forest and bends than the short PMR waves.
• No battery stress: the radio runs on the vehicle’s power supply. No handheld that is flat on day two.
• Both hands on the wheel: the hand microphone hangs within reach on the dashboard instead of a walkie-talkie sliding around the footwell.
• Widely used abroad: channels 1–40 are harmonised across Europe. Channel 9 is regarded as the emergency and information channel, and in many places truck drivers use channel 19.

Pro tip from the Fittery team: channels 41–80 are a German specialty and must not be used abroad. So switch your radio to the right country setting before you cross the border.

Range: what really matters with CB radio

The antenna is the most important part of the radio. A CB radio with a weak antenna won’t get far – no matter how good the radio itself is. In normal use, CB radio typically reaches about 5 to 30 km, depending on terrain, antenna and location.

What determines the range:

1. The antenna and its length: CB radio works with a wavelength of around 11 metres. An optimal antenna would therefore need to be at least a quarter of that, about 2.75 m. That is impractical on a car. Good mobile antennas are therefore electrically lengthened with a coil and still stay manageable.
2. The mounting position: as high and clear as possible, ideally in the centre of the roof. The antenna needs a good connection to the car body – the metal acts as a counterpoise and is part of the “antenna system”.
3. The tuning (SWR): the antenna has to be tuned to your vehicle. You check this with an SWR meter. A poorly tuned antenna wastes power.
4. The terrain: mountains, deep valleys and dense forest swallow the signal. A raised position, on the other hand, gives clearly more range.

And CB handhelds? They are handy, but have only a very limited range. The reason is the short rubber antenna directly on the device. It is much shorter than a tuned vehicle antenna and only suits short distances. For a convoy you should therefore have a permanently installed radio with a good roof antenna such as the Albrecht Gamma 2 F in your vehicle.

Our recommendation: the Midland M88

On our tours we have had very good experiences with the Midland M88. This is what convinced us:

• Easy to read: large TFT colour display with clear indications
• AM and FM, all European country settings available: ideal for cross-border trips
• 12 V and 24 V: fits 4x4s as well as truck-based expedition vehicles
• Clear audio: digital automatic squelch with several levels, noise blanker and HIC filter against interference
• Convoy-ready: Dual Watch monitors two channels at once, emergency function with channels 9 and 19
• Control from the microphone: channel selection with up/down and priority key, 4 memory slots
• Flexible installation: aluminium housing, 188 × 77 × 57 mm, 677 g; with bracket, DIN slot mount and suction mount

To make sure the signal really gets out of the vehicle, we recommend the Albrecht Gamma 2 F for the roof: a 95 cm λ/4 mobile antenna with DV mount, SWR ≤ 1.2 and 4 m RG58 cable with DV and PL connectors included. For fine tuning, there is an adjustment screw under the rubber cap at the tip.

Important legal note on transmit power

The M88 can be set via software – without opening the device – to up to 15 watts of transmit power. Please note that operating at this power is not permitted in Germany. According to the general assignment of the Federal Network Agency, the maximum is 4 watts on FM and AM and 12 watts PEP on SSB.

The European CB regulation ECC/DEC/(11)03, which many neighbouring countries implement, sets the same limits. Anyone operating the device at higher power does so at their own responsibility.

Conclusion: in a convoy there is no way around CB

PMR is fine for short distances on foot. For 4x4 trips and overlanding in a convoy, CB radio has the clear advantage: more permitted power, an external antenna, power from the vehicle and channels used across Europe. With the Midland M88 and a good roof antenna you are well equipped for your next trip.

👉 Get the Midland M88 now at Offroad-Fittery!

Any questions?

Not sure which radio and antenna suit your vehicle? Our team is happy to advise you personally.