"Richard Harrison" wrote in message
...
Cecil, W5DXP wrote:
"The 180 deg. phase reversing coil is the tricky part."

For UHF, you might prefer to use a 1/4-wave short-circuited stub in
place of a coil to reverse the phase. My 19th edition of the ARRL
Antenna Book shows such an antenna, "the super J-pole on page 16-25. At
other frequencies, this might be called a "Franklin Antenna". It`s a
1/2-wave in-phase with another 1/2-wave, one mounted directly over the
other.

The super J-pole is designed for 144 MHz, but can be scaled for any
frequency with proper mechanical allowances. Gain is about 6 dB over a
1/4-wave whip.

Best regards, Richard Harrison, KB5WZZI

Richard

I'd have expected the "gain" to be closer to 4 1/2 db over the 1/4 wave
stub over a ground. is it easy to show where i've missed something?

Jerry