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Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Author use 1/2 inch copper pipe, and the associated fittings necessary. The dimensions aren’t typical however, this is what it took to get its SWR low.
 70cm : Antennas/70cm
Antennas projects for 432 440 MHz
440 Mhz J-Pole Antenna plans is listed on dxzone.com since 2007-03-02
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