Awesome guide! Will recommend to friends. Thanks again! The collinear J antenna improves the Super-J by separating the two radiating half-wave sections to optimize gain using a phasing coil. Instead, buy the best antenna system feed line, tower or mast, ground system, antenna itself you can afford. Today I watched your post on the tribander hand held radio. Just use the formula divided by frequency for the length of your elements. I always planned on using a mag mount antenna on a cookie sheet if I ever had to down-size to an apartment. Some repeaters I thought were not active on my handheld I have found active now!
Video: Antena gp 2m 70cm j-pole Dual Band J Pole 2M-70cm
About SWR. My OSJ / J-Pole went through 3 hurricanes in 6 weeks, with gusts speeds, on occasion, as high as MPH. No damage at all, and it kept.
vhf/uhf vertical or jpole QRZ Forums
A Simple Vertical Dipole Antenna Radio Band, Dipole Antenna, Ham Radio Antenna, 2 Meter Vertical Dipole Antenna Project by Radio Amateur, Dipole. Antenna Farm Page 6M, 2M, & 70cm yagi array, 2M GP in front 10M vertical above a barely visible 2M vertical yagi FM verticals for 6M, 2M.
Add a review Click here to cancel reply.
Like all antennas, the J-pole is sensitive to electrically conductive objects in its induction fields  aka reactive near-field region  and should maintain sufficient separation to minimize these near field interactions as part of typical system installation considerations.
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a quarter wave parallel transmission line stub  of Lecher system form.
Everything Antenna Amateur Base VHF UHF MultiBand Main Trading Company
The top one is a strong copper brass wire of 5 to 7 mm diameter soldered directly to the coil and mounted to the PVC isolator to give a strong construction. The collinear J antenna improves the Super-J by separating the two radiating half-wave sections to optimize gain using a phasing coil.
But how well do these perform? Thanks for the info.
Video: Antena gp 2m 70cm j-pole Tram 1040 2 Meter and 70 CM Vertical Ham Antenna
Real measurements of a Slim Jim antenna and traditional j-pole antenna his 2BCX Slim Jim with a 5/8 wave GP, while perfectly reasonable and Also, does the comparison change for 2m or 70cm as all the data was.
Authentic N9TAX VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole Comet GP-6 2m/70cm Dual band Ham Base station antenna High Power.
It performs almost as well as my old Diamond X did before I sold it. Will recommend to friends. Steve Simpkin — July 19, Love the antenna, made getting on easy.
If you enjoyed this article, why not subscribe to our newsletter. To build this antenna, we first need to make a couple calculations for the length of our radiator and radials.