[exray]

Probably. What I'm suggesting is to hook up the loop and capacitor in parallel and place it close to the Philco loop with no actual electrical connection. Then tune the cap of your newly built wavetrap to around what would be 1500 (almost completely open) and see if you get a dip in the KSTP signal or the image at 590.

It oughta work. I've got radios sitting together on shelves that will often do this.