Freestanding 25g questions - TowerTalk Forum at eHam.net

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eHam.net Forum : TowerTalk : Freestanding 25g questions

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Freestanding 25g questions	Reply
by TOMTECH on October 29, 2009	Mail this to a friend!
Hi all. I would like to put up a 20' 25g tower in a concrete base. the location is on the slope of a hill overlooking a valley. I cannot locate on the top of the hill, but can on the slope near the top. the wind here gets up to 70mph but not often, about 4 times each year. I will be placing a 15lb antenna radio combo that is round (omni) and about 18"h x 8"diameter. I plan on using one 40" section buried in concrete, then two 10' sections. the question is, Do I need to guy this tower? it will be difficult as I only have the two sides. the third side is down the slope and difficult at best to anchor properly. I may be able to mount all equipment before raising the tower, meaning minimal climbing during install. Just maintenance climbing. any advice would be great! Thanks all.

RE: Freestanding 25g questions	Reply
by AA4PB on October 29, 2009	Mail this to a friend!
The Rohn book permits 14.2 Sq. Ft. of antenna on a 20 foot free standing 25G tower for 70MPH wind with no ice. The required base however is 4'x4'x4' of concrete.

RE: Freestanding 25g questions	Reply
by W8JI on October 30, 2009	Mail this to a friend!
Most base failures I see come from plugging up the legs with concrete and having the legs fill with water, or not keeping the leg bolts snug on self-supporting towers.

RE: Freestanding 25g questions	Reply
by N5YPJ on November 1, 2009	Mail this to a friend!
My .02 worth - I once had 40 ft free standing and didn't like it with only light VHF antennas on it and me climbing it every so often so I guyed it - all in accordance with the Rohn manual. Loved it once it was guyed.

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