GMRS Base Antenna

Description

UHF Base Antenna with +5dB Gain - perfect for repeaters  and GMRS- US patent  8,947,313
Available in Commercial (such as GMRS)  (460-470 MHz) version or HAM  (440-450 MHz).
Please include a note when you order on which antenna version you want otherwise we send you the Commercial (GMRS) since this the most popular.
This antenna was featured in
CQ- VHF Summer Addition 2012
“An Omnidirectional Gain Antenna for UHF without Radials”.
Designed by Dr. Ed Fong WB6IQN of Univ. of California (formally at Berkeley and presently at Santa Cruz - Silicon Valley).
It is US Patent 8,947,313.
This antenna offers +5dB gain over a ground plane and has no ground radials. It is only 3 1/2 feet tall.
Perfect for repeaters, backup repeaters, portable repeaters or base station.
This antenna was originally developed under a grant from AC Daugherty Inc. for a MESH network.
It has a small foot print and therefore can withstand 150MPH winds.
It is basically a 2 element vertical phase collinear separate by ½ lambda but with very low loss coupling elements.
Each antenna is custom built and tuned to your requested frequency by me or my graduate students. Profits from these antennas go to my group.
For general HAM use, a center of 445 MHz is adequate.
For commercial use, we request your desired transmit frequency so we can custom tune the antenna for optimum performance.
Default connector is SO-239 ( N type is available for exra - just leave me a note after your purchase).
Product Description:
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42 inches tall
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Frequency range 440-470
(buyer must specify desired transmit frequency)
Antenna is good for 10 MHz bandwidth.
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+5dB gain over a traditional groundplane antenna.
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Impedance: 50 ohms
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Maximum power – 75 watts
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UHF female (SO-239) default  or N connector
This antenna is complete with exception of the 3 1/2 feet of ¾ inch Class 200 PVC pipe needed for the antenna.  Individual shipping of the 4 ft antenna is so we rather you go to Lowe’s (stock # 23990)  or Menard (SKU #6899684) and buy the PVC pipe for about .  If you cannot find the PVC pipe, I can ship the antenna with the PVC pipe.  Please email me if you need me to send the antenna with the PVC pipe.
This will be extra due to the postage.
We can send you a PDF copy of the CQ-VHF Magazine article and also the patent upon request.
The antenna has a lifetime warranty.  Just return it and it will be either repaired or a new one sent to you or 100% cash refund (no questions asked).
Please email via ebay and I will gladly answer any questions.
Thanks for looking.
73’s  Ed Fong WB6IQN