It is true using separate CM-7777s will prevent you from loosing the 3.5dB, but unless you are swtiching between antennas/pre-amp combos with an A/B switch instead of combining them, you will be adding the noise from the pre-amps, which is just as bad (worse actually since you will be adding the noise on VHF as well).Actually, I am using 2 seperate cm 7777 for each azimuth and I am not loosing the 3.5dB.
Strange. One of the nice things about the CM-7777 is that it has separate amps for VHF and UHF. When you use a combined input, it band separates the signal to the two amps. For separate inputs, it filters out the opposite band before the amps. Either way it has a built in signal combiner after the amps. The only thing that makes sense is that the signal is so strong that the VHF input is acting as an antenna and picking up 10-12. Do you have a 75ohm terminator on the VHF input?VHF analog channels from (hi-vhf 10-12 not digital yet) are actually coming in better by going in cm 4221 and being vhf-filtered by uhf port. The filtering is preventing the overload on cm 7777 LNA input. When I use Montreal cm 7777 with common port vhf-uhf, I loose uhf channels (desensitisation from analog lo-hi vhf) and analogue channels hi-vhf 10-12 are to strong and displaying with double images on TV.
Just make sure you connect it as a band separator to ensure VHF-LO terminal doesn't act as an antenna and feed signal through to your TV. Either way, best to put a 75 ohm terminator on it.I will certainly try HLSJ VHF Band High-Low Antenna Separator-Combiner.