On Monday, March 17, 2014 4:56:43 PM UTC-4, Richard Ferryman wrote:
I have never seen a design for a trap diople or similar dual band antenna

for 20M and 30M although my modelling shows it should just about work

although the end section after the trap is very short. Commercial antennas

are all either the normal bands or the WARC bands but not both with the

exception of lossy resistively loaded wide band antennas or rhombics. Has

anyone tried this combination?

Dick

Add a parasitic 20 meter element to a 30 meter dipole. Works for me.