[Paul Philco322]

I believe that is probably the external antenna jack. These two pages will explain everything:

http://philcoradio.com/phorum/showthread.php?tid=1472

http://www.philcoradio.com/phorum/showth...p?tid=2599

Thanks Ron:

Very interesting, this set is very sensitive and pulls in a lot of stations as is. I can imagine what I could get with a good longwire. The internal antenna looks like copper plumbing, pretty unique. I have only seen this style internal in Philco's.

Thanks much.

Paul