[Roger Cole]

Attached is a pic of my Philco 60 chassis prior to restoration with the wavetrap marked. The flat metal part is the capacitor, and there is an inductor buried back behind the cap. There is an adjustment screw for the cap accessible from the top side of the chassis.

The purpose of the wavetrap is to block IF frequencies (460 kHz here) from entering the antenna circuit. Anything at those frequencies coming in from the antenna is noise, and it blocks this from the RF and IF amplifiers. The later models of the 60 had this, and you can see the updated schematic at http://www.philcoradio.com/tech/60evol.htm

I'm not really sure where you are trying to inject RF, or what frequencies you are working with. Try posting a picture of which cap you are concerned with and I might be able to help.