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Dual Band Base Station VHF/UHF J-Pole - Available in HAM (144-148 MHz and 440-450 MHz) or Commercial (152-157 MHz and 460-470 MHz). Maximum power input 75 watts.
True Dual Band base station antenna. Don’t be fool by claims of dual band performance. Although traditional VHF J-pole antennas will resonate at UHF, they suffer a –6dB loss at UHF over a ¼ wavelength groundplane. This antenna was featured in the Feb. 2003 QST and designed by Dr. Ed Fong WB6IQN of UC Berkeley. It is the same antenna that appears on the front cover of the ARRL VHF/UHF Antenna Classics Handbook. It also won the best paper of the month award. It offers true ½ wavelength performance at both VHF and UHF with no ground radials. SWR is less than 1.3 to 1 on both bands. I have my students build these (and often myself) as an exercise. The proceeds are shared among my students. The antenna has been so successful that it has been adopted by the Red Cross, ARES and numerous municipalities for emergency deployment. Copies of these agencies evaluation reports are available by emailing me. A copy of the original paper on how this novel antenna works is available from edfong "at" ieee "dot" org. Every antenna is hand tuned (by me or my graduate students) to meet specifications. The proceeds of this antenna go to my graduate students.
Beware of imitations.
There are others on eBay that virtually make the same claims (and even
exaggerate) and their antennas even look
like ours and require you to purchase the PVC pipe. That antenna is not the same. It is a standard VHF j-pole that resonates at
UHF (all antennas do that).
The antenna has a lifetime warranty. Just return it and it will be either repaired or a new one sent to you.
Any questions call me at 408-245-8210 (Pacific Standard Time) or email me at edfong "at" ieee "dot" org.
73’s Ed Fong WB6IQN