Doug Whitman wrote in
news
make my own antenna

http://www.hamuniverse.com/jpole.html

http://users.marktwain.net/aschmitz/...jpolecalc.html
Super J-pole. Has 3 db more gain than regular Jpole.

http://www.alpharubicon.com/elect/jpolejaden.htm

http://n4bz.org/ham/jpoles.htm
Build the twinlead version out of 300 ohm TV antenna twinlead and wrap it
up with some emergency coax. Stow it in a little box, buried in a
cabinet. That way when the main antenna fails, during that storm in the
night, you can bring out the little twinlead J-pole VHF antenna and plug
it into your marine VHF walkie talkie, haul it up the mast with any
lanyard from the top and tie the line off to the handrail to get the
jpole away from the metal bits, like the mast. Voila, a $1 emergency VHF
marine antenna. Every boater should have one.

http://www.w4zt.com/jpole/
Don't use the 2 meter ham band measurements in any of these jpoles. Use
one of the calculator webpages in javascript and substitute the
measurements it suggests when you put in 157 Mhz into the webpage
frequency box. See how neat the portable J-pole for a walkie talkie is
made at the bottom of this webpage....emergency comms, even from the
liferaft with any length of some kind of pole or even flown by balloon or
kite to get altitude. I'm in Charleston, SC. We borrowed an advertising
helium balloon that looks like a little blimp from a car dealer and tied
a j-pole to the bottom of it with 250' of RG-58 cheap coax. Payed out to
the end of the coax roll, up 250' AGL, our range to repeater stations on
VHF 2 meter band was about 200 miles! Perhaps a kite and balloon, like
the old WW2 LF grinder distress radios had, would also be a great idea in
a liferaft to extend VHF range.

http://www.vcars.org/tech/J_Pole2M.html

http://www.dxzone.com/catalog/Antennas/J-Pole/
Here's a whole webpage of URLs to Jpole websites....(c;

As the center and shield of the coax cable are BOTH hooked to the copper
pipe (or twinlead loop), these antennas are very safe to use for the
radios. There is no static voltage feeding to the radio, etc. They
measure a dead short with an ohm meter across the coax cable
connector....

Bon Appetit!