No standard HU.Is this on an aftermarket HU, May be worth while buying a signal booster from Halfords about £10 put it into the back of the HU you splice the power cable to a power cable on the HU and will give you a better signal.
When I replaced the HU on the FN2 the radio was really bad so got myself one of these and no more issues.
LolMine reception is great in the dry,but when it rains its shocking
Thats just a typical broadcast from Radio 1With rear demister on, and tuned into Radio 1 all I used to get was white noise. I bought an earthing kit and although the problem isnt 100% its definitely alot better since fitting.