After 3yrs of use, I have so many comments to make.
The Pure Highway enables you to listen to DAB radio stations on your standard FM car radio.
It can also be used as a personal DAB radio, using headphones (not supplied) as found on many modern mobile phones. You need to put AA batteries in the unit for it to work.
From my experience, this 'personal' DAB function tends to eat batteries, so you will need high capacity ones, which are rather expensive.
OK for listening to DAB whilst out walking, but not a substitute for home DAB. It would be far cheaper in the long-term to get a basic DAB radio for home use costing £25 or so.
Now to the 'car' use.
The highway uses 'vacant' FM channels to transmit the received DAB signal to your car radio. I am a taxi-driver in Cardiff, and use the Highway to receive Talk Sport (not so good on AM), and Planet Rock (only available on DAB).
The Highway searches for 'vacant' frequencies on FM to send the signal to your car radio. In Cardiff there are very few 'vacant' frequencies, and the ones found by the unit often have 'bleed-over' from the existing FM stations. There also seems to be a problem in this area with local 'rogue' FM stations only transmitting at certain times. I suspect that they are transmitting at low levels illegally, and blocking up the 'available' frequencies. This results in a 'fuzzing' of the reception. The only way around this is to keep 'retuning' the unit. Rather frustrating.
A common fault with this unit is the car power lead. It is far too flimsy, and I have got through two of them. After much use the wires inside fracture, and break the power connection. Also, the connection to the unit is NOT designed for unplugging every time you leave the vehicle. After time this connection can become worn, and needs a bit of fiddling to connect. A simple way around this is to hold the power lead to the unit with blue tac. This way the contact stays constant, and when you remove the unit (for security reasons), you will be reminded that the power lead is best kept in place.
Having got through two dedicated Pure power leads, I have found that the power lead for my Garmin Nuvi sat-nav is exactly the same fitting, and works perfectly.
Other advantages using the Garmin power lead are,
1, The Garmin lead is far more robust, and much less likely to fracture.
2, The Garmin lead is much cheaper than the 'dedicated' Pure item.
The supplied windscreen mount aerial is fine for most users.
I bought a 'mag-mount' aerial to enhance reception. The aerial for the Highway is 'active' rather than 'passive'. This means that it is powered, so you need to buy a 'Highway' enabled aerial.
Don't buy this item from Pure, an identical one can be bought from 'dabonwheels' at about £18, with a MUCH longer 5m lead. Better and cheaper.
The mag-mount aerial gives better reception, but also picks up more interference. I would say, get one.
A common fault with DAB, especially in cities, is the 'blanking-out' of the signal.
As a taxi-driver, I know the main reason for this.
Taxis with company radios are constantly receiving and transmitting radio signals. These signals can be strong enough to travel 20mls or more.
In a city centre, at very short distance they can easily 'blank-out' the DAB signal. Also the bus company in Cardiff use similar radios, which also have the same effect.
To summarise, I would say, DO NOT buy this item as a cheap solution to a dedicated in-car DAB radio.
After all, you only receive the DAB signal on you car radio in FM quality, not DAB quality.
The unit only allows you to receive DAB stations via FM.
If you are like me, and want stations such as Planet Rock and others, only available on DAB, then this unit is a must.
Also Talk-Sport is much better on DAB than AM.
Whatever you do, don't pay the £90 or so some retailers ask.
Go for the best possible deal, and accept in advance that this product does have its' flaws over a 'proper' DAB car radio.
You pays your money, and takes your choice.