i swapped out the stock deck for a pioneer p-930, but i get garbage for radio reception. i know some people on here were talking about putting power to a power antenna wire to activate a factory signal amplifier. does this work? has anyone tried it? which wire? and is it 12 volt or stepped down to some lower voltage?

http://www.scionlife.com/forums/viewtopic.php?t=7289&highlight=reception