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Walk into any electronics shop or browse a car boot sale and you’ll see radios labelled FM, DAB, DAB+ or a combination. They all promise clear sound and easy tuning, yet they are not the same. If you live in the UK and listen to BBC Radio 4, Classic FM or a local community station, the differences affect what you can hear, how it sounds and what you need to buy. This guide breaks down the three main ways to receive broadcast radio, without the jargon.
FM, or frequency modulation, has been the backbone of UK radio since the 1950s. It broadcasts on the VHF band, roughly 87.5 to 108 MHz. The signal is analogue, which means it varies continuously with the sound wave. That gives FM a natural, warm quality that many listeners still prefer for music.
Its weaknesses are familiar. Hiss, crackle and interference from buildings or hills can creep in. In a moving car, you might notice the signal fade or flutter. But FM has one big advantage: coverage. BBC national stations and major commercial networks reach most of the country, and a simple set of rabbit ears or a car aerial is often enough. You do not need a special decoder. Any FM radio works, and many smartphones still include an FM chip that uses wired headphones as an aerial.
DAB, or Digital Audio Broadcasting, arrived in the UK in the late 1990s. It turns sound into digital data and squeezes several stations into one multiplex — a bundle of services broadcast on a single frequency. That is why you can scroll through dozens of stations on a DAB radio without retuning.
The original DAB standard uses an audio codec called MP2. At the bit rates typically used in the UK, it can sound clean and free of hiss, but it also introduces artefacts: a watery, bubbling sound often called “bubbling mud” when the signal is weak. DAB also suffers from the cliff effect. Unlike FM, which degrades gradually, DAB is either perfect or silent. A few metres in the wrong direction and the audio drops out.
DAB radios are common, but not all of them can receive DAB+. If you own an older DAB-only set, you may find that newer stations are unavailable.
DAB+ is not a different broadcast system in terms of infrastructure. It is an upgrade to the same DAB multiplexes, using a more efficient codec called AAC (or HE-AAC). The practical result is that broadcasters can fit more stations into the same space, or improve sound quality at the same bit rate.
For listeners, DAB+ often sounds better than DAB at equivalent bit rates, especially for speech and pop music. It is also more robust in marginal signal areas. The catch is compatibility. A DAB-only radio cannot decode DAB+ broadcasts. You need a receiver with a DAB+ logo or a menu option that mentions DAB+. Many radios sold in the UK today are DAB+ compatible, and most new car radios support it, but it is worth checking before you buy.
Some UK stations now broadcast only on DAB+, particularly on local and community multiplexes. If your radio is DAB-only, those stations will appear as silent or not at all.
There is no simple winner. It depends on the station, the bit rate and your equipment.
FM can sound excellent, especially on a good tuner with a strong signal. BBC Radio 3 on FM is a benchmark for many listeners. But FM is analogue, so noise and interference are always part of the package.
DAB at low bit rates can sound thin or metallic. DAB+ improves on that, but a poorly encoded DAB+ stream at 32 kbps will still sound worse than a well-encoded DAB stream at 128 kbps. Bit rate matters more than the label on the radio.
In practice, most people notice the difference most in the car. FM fades; DAB and DAB+ either lock on or drop out. For speech radio, DAB+ is usually clear and reliable. For critical music listening, a good FM signal or an internet stream may still beat DAB.
FM coverage in the UK is extensive. National BBC stations and major commercial stations reach the vast majority of homes, and local FM stations fill in the gaps. If you live in a city, a piece of wire will often do.
DAB and DAB+ coverage has grown, but it is not identical to FM. Hilly areas, deep valleys and some rural parts still struggle. Indoor reception can be tricky because DAB signals do not penetrate thick walls as well as FM. A rooftop aerial or a good indoor aerial near a window makes a big difference.
Here is a quick checklist for getting the best reception:
Your existing equipment may already cover more than you think. Here is the practical breakdown:
If you are buying a new radio, choose DAB+ even if you mainly listen to FM today. It future-proofs your purchase and gives you access to the widest range of digital stations. If you have an old DAB-only set, it still works for DAB and FM, but you may miss out on newer services.
Start with what you actually listen to. If your favourite shows are on BBC national stations and you live in a strong FM area, a simple FM radio may be all you need. If you want dozens of digital-only stations, or you listen in a weak FM area, DAB+ is the better bet.
Check coverage before you commit, and do not assume that “digital” automatically means better sound. A well-set-up FM aerial can outperform a badly positioned DAB radio. And if you are happy with your current setup, there is no rush to change. FM is not being switched off yet, and DAB+ radios are getting cheaper and more common.
For most UK listeners, a DAB+ radio with FM is the most flexible choice. It covers the past, the present and the near future in one box.
Photo: Skylar Kang / Pexels
