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That doesn't appear to be a satellite antenna, it looks more like a wireless internet service antenna. Very different equipment with very different potentials for interfering with OTA reception. Please see if you can accurately identify the operating frequencies used, you will need to call the service provider and find someone with the knowledge.
Please clarify the following:
Which PBS station (WMEM?) ?
What direction are the antennas aimed for that station?
What preamplifier is installed?
How are the two antennas combined?
Clarify symptom: Did you loose all of that PBS station or do you only have audio for that station, including any/all subchannels?
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