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.
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About 440 Mhz J-Pole Antenna plans
The resource is currently listed in dxzone.com in 2 categories. The main category is Antennas projects for 432-440 MHz
that is about Antenna for 70 cm 432-440 MHz.
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