I have a dual mode satelite system where two TVs work off the same receiver; however, the second TV has stopped responding to the remote because the UHF signal from the other TV is too weak. Dish Network suggests getting a cable at least six feet long and installing the UHF antenna on the wall over the TV. My old dual receiver did not have this problem, and the two TVs are in the same rooms as before installing the new HD receiver. How do I solve this weak signal problem?