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I'm guessing that it's overload, from being too close.
I would also try starting out w/ just the antenna and no preamp and then adding TVs one by one.
Was there ever a time when all worked well, or is this a new system?
On a side note, Back in my Waukegan days, WBBM was always known as the channel w/ the worst reception.
Now that I'm up in Kenosha County and they went digital though, it has not failed me once.
Not that it matters for me though, since I haven't had any reason to watch CBS since Andy Rooney passed away.
It is now at real channel 12, so that is at the high end of VHF.
U/V signals do not cut off at certain points, they roll off gradually.
I am also able to receive it w/ a UHF antenna at about 47 miles, so you may want to double check connections, for water tightness if it's been in service for any length of time.
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