said by BF69 :

The reason for the poor signals is that the stations are having to carry both digital AND analog signals.

said by Lazlow :

guypd

Have you checked over at tvfool to see if they are going to turn up the power after the switchover? Many stations are now only putting out a low power DT signal but will turn it up after the switch over. Here one station will be going from 100 to 800. Which I am assuming will greatly effect the range of the digital signal.