Your report indicates you should be able to get WTAE 51 with your CM antenna and a preamp. It is listed a being much stronger than WWCP. RabbitEars.info lists it as being stronger than KDKA at 25 feet:
but the coverage is very spotty in your area because of the rough terrain:
Have you tried to get WWCP by aiming your CM antenna at 158 degrees with a preamp?
If you want to keep your CM antenna aimed at Pittsburgh for UHF and VHF with a preamp, you can try this inexpensive VHF antenna aimed at 158 with a preamp for WWCP:
http://www.newark.com/stellar-labs/3...vhf/dp/71Y5462