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I'd suggest you start at the antenna. Each antenna should be capable of driving a single tuner with no accessories. To test, connect the antenna via a known good coax, not longer than 50', though shorter is better if it's practical. Connect only one tuner, preferably one with a good signal quality/strength meter function.
Does each antenna produce a reliable signal for each desired channel? If not, you need to consider changing the antenna, it's location or it's aim... or some combination of these.
Once you have established reliable 'barefoot' (non-amplified) reception, then consider the need for amplification. In this case, I doubt the need for a preamplifier on the main antenna, but the 91XG may benefit from an RCA TVPRAMP1R at the antenna.
It's also possible that a 3 dB or 6 dB attenuator on the inputs of the AC7 combiner may help by isolating less than perfect cable impedance or antenna SWR. The resistive termination of an attenuator may help the tuned filters in the AC7 behave as designed. The CM-3414 is going to overcome enough loss that a few dB of attenuation should be quite tolerable.
Don't rule out the possibility of FM interference either. An FM trap is not expensive. The Radio Shack #15-024 is about $5.
At the risk of being 'nosey', how much does tinlee get for the AC7 these days?
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 24-Apr-2014 at 2:18 AM.
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