Your problem condenses down to the fact that you have a UHF antenna and the two problem stations (KJWP and WPVI) are both low-VHF, far out of the design band of the antenna you have. The fact that you receive them some of the time throughout the daily cycle is more coincidence than by intentional design.
Call Solid Signal and tell them you need either a low-band VHF antenna with an HLSJ combiner or you need to swap out the UHF antenna for an all-channel antenna.
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