Hi,
This past week I lost the only two VHF channels in our viewing area (81501) which I had previously received with a very strong signal with the antenna mounted on cast iron waste stack at least 35 ft up with all the proper grounding. All UHF channels continue to come in strong. I have tested the antenna on digital tvs in two different homes with neither 8.1 or 11.1 getting a signal from antenna. I have been totally satisfied with performance with the Winegard antenna up to this point but I see another post (Lost signal Overnight on 3 stations using MS-2000) had the same problem. I am beyond the 90 day warranty with the antenna purchased in Jan 2010. My questions are: are there any user serviceable parts in this antenna, ie: amplifier board and is it worth it to replace; if I do replace it is there possibly anything in an installation that would cause the amplifier board to fail; and if not is this a common problem with Winegard MS2000 antennas?
Thanks

