I utilze an AM21 to pull in a secondary local market with my HR34. I wanted to pull in the secondary locals FOX station so i upgraded my antenna. Before i mounted the antenna on the tower, i just hooked up to AM21 while outside and pulled in most stations including the one I previously couldn't acquire with the older antenna after a rescan. I installed the antenna to the tower and went inside to find no signals at all on any channel. I disconnected the antenna from back of the AM21 and installed direct to tv and it is pulling in all channels. Reinstalled back into AM21 and nothing. I have reset HR34 multiple times, done initial setup more often but nothing seems to work. Could the AM21 really have just died between the time antenna was on ground back to when i mounted on tower?