The Diamond bottom tube may, (and likely) contains a broad band ferrite cable choke. Or there may be a combination trap/ loading coil such as used on some tri band beams for multibands.
Stuart K5KVH _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com