It may be that the output channel on the new Labgear amp is close to a local transmitter or one of the rf outputs is close to the rf output of the new amp. It may be worth changing the amp output channel and concentration initially on one TV. If you get that to show your missing channels yo may have to retune all the other appliances to that output band. You may well have the new amp on the same channel as the old one, but different horses for different courses. The properties of the new amp may just be causing what may have been borderline into a bandwidth clash. Good Luck.