Your attic goal will limit your ability to pick up an ABC station. WPVI is on channel 6, a low band VHF channel. None of the antennas that you have tried are capable of low band. WMAR is possible with a good antenna, but in another direction than the Philly stations that are easier to receive than the remaining Baltimore affiliates.
Reception of WPVI will require a low band antenna such as a Y5-2-6 or a large all channel antenna. Yet I'd rate the chances of success at less than 50/50.
Reception of channel 38 in the attic is around 50/50 with the largest UHF antenna plus preamp but even if successful your WMC will be stymied by the inability to add the antennas together efficiently.
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