today I received the Ed Fong J-pole antenna.
Eham Reviews of Antenna 5.0/5
PDF of antenna design and specs
Ebay Linked Here
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 email@example.com. 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).
This antenna is complete with exception of the 5 feet of ¾ inch Class 200 PVC pipe needed for the antenna. Individual shipping of the 5 ft antenna is $10 so we rather you go to Lowe’s (stock # 23990) or Orchard Supply (stock # 648-5908) and buy the PVC pipe for about $1. It is pretuned for 144-148 MHz and 440-450 MHz for ham bands or 152-157 MHz and 460-470 MHz commercial band. Please indicate with your order which antenna you wish in the special notes section. When deployed, it will give about +6dB of gain over a rubber duck antenna. It comes complete fully assembled with end caps and an SO-239 connector. Just insert it into the PVC pipe and you are ready to go. Please email me if you wish an N connector and/or a 250 watt version. The N-connector is $6 extra and 250 watt version is $10 extra.
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 or email me at firstname.lastname@example.org.
73’s Ed Fong WB6IQN
It shipped in a manila envelope via USPS. Inside the envelope were a receipt, instructions/technical data, a PVC end cap and a wire that was soldered to a SO-239 which was fitted to another PVC end cap.
As mentioned in the email I received from Ed after placing the order I had on had a 10' stick of 200 PSI 'white' PVC pipe ($1.98 at Lowes for the stick)
Make sure you have at least 5ft of 3/4 inch 200PSI PVC pipe. This is not the same as the standard Schedule 40 PVC pipe. 200 PSI is about one half the thickness and has much better RF characteristics than Schedule 40. I purchase mine at Lowe's (item #23990) but Orchard Supply (item # 648-5908) also carries it. If you cannot find it, I can send it to you free of charge, just pay the postage. It is usually $8-10 depending on the location.
So I cut the PVC pipe to the stated 5 feet (60 inches).
Slid the wire into the pipe, secured the end caps, taa-daa
I then grabbed the ext ladder and a few clamps and tossed it up in the air!
I'm now maybe 8 minutes into the entire deal.....I connect the other end of the coax to my Kenwood TM-231 set on Medium power (as always) and call on the local repeater. Quick reply comes back and states strong signal with full quieting, short QSO follows and then I decide to lower and paint.
Gray Primer-guess it will blend a bit when I get it mounted on the Eave Mount I'm awaiting-will continue post at that time.
From my initial findings, I'm super pleased with the antenna, super easy to assemble and nothing to poke me in the eye or anything-I believe this would make a great EMCOMM antenna-YMMV
Compared to the "Bow" used with the Slim-Jim....this seems to have less exposed to get broken...or noticed for that matter. Who's to say you couldn't add a eye-hook in the top cap and pulley it up somewhere if you wanted....