WebAt VHF and UHF this is not as critical as at HF frequencies (read up on ground loops ). It is always a good idea, if bad weather is in the area, to disconnect the antenna feed line from the radio and isolate it or ground the center pin of the coax to your new station ground. Keep in mind that if your antenna is the tallest thing in the area it ... WebApr 1, 2012 · The KB9VBR 2 meter J-Pole antenna is 69 inches tall overall. You will need a peak in your attic that is tall enough for the antenna to fit. If the top of the antenna touches the walls or roof, the performance may be affected slightly. If you attic isn’t tall enough, you could angle the antenna mounting to make it fit.

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WebJan 18, 2024 · One of the authors of an out of print book called “Magnetic Loop Antenna: Slightly Different Each Time” has a website with some key maths and an online calculator. Here is a simple table comparing my realized 6.5 ft diameter loop for 40m vs the same conductor length in two turns with a diameter of 3.25 ft. The effeciency drops by 67%. http://miklor.com/COM/Review_DBJ1.php bursting art

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WebEd Fong DBJ-2 (Commercial) Dual Band Roll Up Antenna Kit (Blue Tag) Brand New. $59.00. Seller: offgridready (64) 98%. Buy It Now. +$5.99 shipping. 7 watchers. Sponsored. Ed Fong Ham Antenna DBJ-1 (ham) dual band … WebFeb 18, 2012 · 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 … hampton and sons pall mall