When i did my head unit install myself i had shit reception. i took it to a stereo installer for another problem, and he did something to my aerial to get it working well. can't remember what he did, but something about a booster or power or something. anywho, all i remember is the aerial has a thick black cable and a thinner black cable coming off it. the smaller one wasn't hooked into anything and i figured it was just something from the stock stereo. it might need to be hooked into something to work, earthed or given power or something. i can't remember sorry, but any stereo guy should be able to fix it.