Long time follower and first time poster. I have a question about the power line to the radio antenna amp, where or what sends power to the amp? Is it 12 volts or less? I have replaced the original radio and still have terrible reception as before so I checked the antenna lead for continenuity and it appears the lead is broken between the mast and the cable connection on the pillar. The cable measured good from the pillar connection to the radio plug but I could not get any voltage reading for the lead to the amp. Any help would be appreciated.