Just came across this old tread by accident.
But I can underwrite about interference from 5Ghz wifi stuff on satellite HD receipt.
We had mayor problems receiving HD TV on a dish that worked for years with SD TV even under the harshest (heavy rain, thundering clouds) circumstances.
Last winter we installed a new TV set and upgraded our ASTRA subscriptions to receive Dutch TV channels here in Spain in HD quality.
Me and some skilled technician with pro satellite frequency and alignment tools worked for 2 days to find the reason why HD channels were very poor to almost impossible to receive.
We replaced and measured everything; coax, 3 x different LNB, 4 different receiver, etc.
Until one moment I thought about my tower with about 8 different 802.11an antennas (some that were receiving high signals from the other end of a link. These signals sort of 'looked' straight into the sat dish parabool too..) at only 5 meters distance.
So we decided to hang the sat dish on the side of the house. Out of sight of the wifi tower and also completely obscured from remote antenna beams... Gone were our problems. Rock solid signal now.....
So yes, 5Ghz definitely has an impact on the receipt of satellite digital HD TV signals...
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.