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Re: 6 m repeater antenna


 

Nice work, Mike!? You really don't need the grey element spacers for 6M, as I see you left them off, possibly to reduce wind load.. Sometimes the end braces are needed in their place, if icing or high winds. Also a good idea to invert so the fed half is on the bottom, so the stronger half is on the top to better resist falling ice, or someone climbing the tower stepping on the coax! . Then be certain to place a drain hole just above where the insulator begins.That will be inside the center brace, if you angle the hole upwards. When you have the end piece off, is the time to measure where the top of the insulator is located.
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King Starboard (ultra high density, UV protected polyethylene) from a marine supply company is a good source for the element brace.
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Really great 6M repeat antenna, especially two on the same leg. Had a pair last over 35 yrs at 3500 ft, high winds, multiple lightning strikes, feet of rime ice, etc.No precip static if wrapped with vinyl tape, and because side mounted close in, no? coronal discharge noise
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John

On 03/28/2025 10:32 AM EDT Mike via groups.io <prcradio@...> wrote:
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Its not related to a J-pole, the DB Products dipoles are simply a center fed dipole with a fat grounded element and the driven element is a folded monopole. Probably much lower impedance than a typical dipole of 72 ohms in free space due to its girth but when placed really close to a tower leg the impedance gets pulled way down.?
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I recently picked one up at a swap meet and used some excellent info from this group and tuned it for 6m.?
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