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DDRR antenna help please

DDRR antenna help please

DDRR antenna help please

(OP)
Help!  I am experimenting with a DDRR antenna for two meters because I need a low profile vertically polarized antenna.

I have seen several examples on the web but no tech data on how the dimensions are determined. The examples I have seen show a spacing above the ground plane of 2 to 4 inches.  How do I calculate the optimum spacing?

Thanks

RE: DDRR antenna help please

See:
http://www.google.com/search?q=DDRR+antenna
Especially...
http://www.orionmicro.com/ant/ddrr/ddrr1.htm
http://www.orionmicro.com/ant/ddrr/ddrr2.htm

I also did a quick search on the USPTO website (www.uspto.gov), but I couldn't find any antenna patents by 'Boyer'.  Maybe just missed it...

RE: DDRR antenna help please

(OP)
thanks.  I had seen some of the stuff before.  Seems most of the documentation is for 3-30 mhz stuff but one of the sites had a design program.  Appreciate the help.

randy

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