[GroundUrMast]

Rule of thumb #1: If it's not broke, don't fix it.
Are you having problems with the picture pixelating or intermittent loss of signal? If not, then I'd suggest you not worry about the signal meter indication.

If you are seeing problems with reception, then...

Rule of thumb #2: One amplifier can be too many, two amplifiers are too many.

There is more to reliable reception than signal strength. Signal quality matters as much or more. Electronic noise, interference from other transmitters, multipath and a variety of other passive transmission impairments can all reduce the quality of both weak and strong signals. Two amplifiers in a row will add noise and quite likely overload, causing distortion that destroys the quality of the signals.

Most amplified antennas do not provide a way to remove the amplifier. As far as I can tell, the Terk HDTVo does not provide that option either. (Please, someone, correct me if I'm wrong.) If the amplifier can not be removed from the antenna, you're left with two options.

1. Verify the antenna is pointed toward the SW (it sounds like you've already done that) and there are no obstructions in front of it. Raise the antenna higher, if it's safe to do so.

2. Replace the antenna.

If this were a new install I would have recommended a non-amplified antenna such as the Winegard HD7694P. I would also suggest that you go with the consensus of your neighbors and mount high, in the clear - Using a roof mounted mast. Your signal prediction indicates little if any need for any amplifier. There is enough signal power in the air to easily drive two sets on all the stations not affected by adjacent or co-channel interference.

Rule of thumb #3: Antenna gain is better than amplifier gain.
Antenna gain will deliver more signal power and... improve the noise margin (one measure of signal quality - the antenna can add gain with out adding noise). Amplifier gain also increases signal power, but at the expense of reducing the noise margin (amplifiers add noise).