stoner – Don’t suppose it’s got a plug for a coax aerial, has it?
Signal’s not great at mine, but I’ve made myself a couple of these for the kitchen and the bedroom with great results: http://www.audiobritain.co.uk/DAB.html
Edit: hmm. linky no worky. coax cable – strip the last 30cm down to the bare wire core, strip the outer off the next 30cm so you’ve got bare braid (tape round the end of the braid to stop it unravelling).
Then make 2 complete 50mm loops in the next section of cable so you’ve got the bare braid, then the bare wire hanging vertically, secure the loops with tape to keep them in place, hang it somewhere with the best signal – e.g. window, then wind on a connector (£2, maplins) to the other end so you can plug into your tuner.
You’ll need the cable long enough that it will reach, obvz, as long as the aerial end is made correctly, the length of cable to the tuner doesn’t seem to matter much.