Topband: Two band antenna

[Jim Jarvis]

I had good success with a 160/80 elevated GP in Vermont.
The lower 63' of the antenna was made from 450 ohm transmitting
open wire line.  The top was #12 insulated superflex.  

I started with 68' of OWL, and gradually trimmed it down to reach
resonance.  It was fairly low Q, for an elevated GP.  3:1 @ 3.5
and 3:1 @ 3.8, and 1.5:1 for 150KHz in the middle.  Four radials 
per band, each 5% longer than the radiator.  

If you were to make a phased array of them, you'd want to work out
matching for 80/75.  A slightly more complex structure, with a third
wire would give you a double humped response.

N2EA 

jimjarvis at ieee.org