CBS KSPA is on real VHF-High channel 7. Your antenna is not suitable for that channel, no matter what the marketing description says.
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We do have a rack of 29 solar panels on this rood and tried to stay as far away as possible to electrical components.
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That's probably a good idea. Inverters can create interference to VHF signals.
The interference can be radiated or conducted. In extreme cases it is necessary to mount an antenna away from your electrical system and run the TV on a sine wave inverter like the Exeltech.
Is the coax shield grounded?
The coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety
and to reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.