Pixalation with full bars is nothing unusual. With the signal strengths at your location your antenna is choice is "spot on", however untill you resolve the interferrence I would keep the amplifier out of the picture.
Interferrence usually comes from one of two sources: unwanted out of band communications signals, or electrical. Since your problem is across the entire spectrum (broadband) and all communications signals are narrow band, it is more likley electrical. This can be from inside your home or something in your neighborhood.
Some suggestions for inside:
Shut off any florecent lights, dissable any remote phones, modems and all other wireless devices. Try powering your equipment from a different electrical circuit. also if possible you could try turning off circuits in your home (one at a time).
Outside electrical can come from a bad ground in the power grid (transformer ECT), or if you are in farm country an electric fence. This can be a little tricky to resolve. Hopefully the tips that I have provided help you resolve the problem, and other experts on this blog will chime in if they have any ideas, interferrence or otherwise.
Last edited by signals unlimited; 18-Apr-2012 at 11:50 PM.
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