03-02-15, 12:31 PM
As an experiment, try ditching the booster.
If the signal strength was OK with it before digital switchover then it'll probably be OK without now as the transmitted power went up 10-fold. Cheap aerial amplifiers are usually crap… a higher noise figure than the input stage of your TV/set-top box and often overload easily so that out-of-band signals cause distortion.