[A J Ricaud]

Would it be advised that I get an antenna high gain signal amplifier?

Your description is classic of "multipath distortion" (i.e. signals from more than 1 direction) which interferes with the signal. HD Tivos are notorious for this problem. Do a search for multipath in this forum for info. and recommendations.

 

[A J Ricaud]

wozman57

The signal strength on those channels are quite high. Good for most receivers, including your TV, apparently, but may be overloading the HD Tivo's tuners. Try a Radio Shack variable attenuator on the HD Tivo's OTA feed, adjust it down, and see if it helps. It is quite inexpensive, so no great loss if it doesn't help.

 

[A J Ricaud]

Are you sure this is happening only with OTA? It almost sounds like a hard drive going bad.