[rghines1]

First, be very careful assuming no isolation transformer is available... shock hazard!

Try shorting out the antenna (L1) or C2 to see if the interference is greatly reduced. Otherwise noise is likely internal to the radio.

To tune antenna, move the dial to 1400 and adjust the rear gang trimmer for maximum background noise. This is basically Step 3 in the alignment procedure w/o benefit of a signal generator.