I can not say if it helps or hinders in my application. I am using with hopes it bumps up signal to help compensate for the long runs of coax. I really wish I would have spent the couple extra bucks and went with RG11 but that is water under the bridge now. I am getting excellent readings from the 90cm which has an amp mounted on the lnbf mounting arm.
Readings like 66-73 for 11720 on G10R that was 33-40 on the 76cm with no amp and a far shorter run of coax. Now the lnbf is different along with dish. The dish pointed at 40.5 is in the 150 - 175' range from the receiver with a DiSEqC about midway. It also has an inline amp mounted on one of the arms of the feedhown mount. Again I am getting excellent readings on many of the tp's. Not so great on others and I honestly have not looked to see if the weaker ones are opposite polarity.
TIP on 87 comes in at 93 but interestingly enough KTEL on 79 was 88 on the 76cm and now about the best I can find on the 90 is 78-79. I have a 80' run for the DSR922 and it hits hard everywhere so I see no need to place any amps on it. Guess I could experiment and take the amps out of the circuit and see what I have. Perhaps one day. Starting to get cold here now so I doubt if it would be this year
