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Author Topic: Vertical antenna question  (Read 921 times)
KF5PGT
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Posts: 38




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« on: March 21, 2013, 08:14:36 PM »

Lets say I want to put up a 10 meter vertical antenna in my attic. It's 10.5' but my attic is only around 8' high. What would happen if I installed the antenna on an angle to fit?
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W5WSS
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Posts: 1605




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« Reply #1 on: March 21, 2013, 08:38:14 PM »

The Hustler Mo-1 vertical is 54" and then the resonator and whip combined in total length will fit in less than an eight foot space.
The pattern is altered away from omnidirectional when a slope angle is added by more than 15 degrees and increase with increased angle respectively.
I have one on my indoor wall along with sets of tuned radials per band.
The vertical being an elevated ground plane with horizontal radials 2 per band and tunes although loading of the building shortens it slightly.The antenna fits the space from 10m to 20m where no sloping is involved.
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AD6KA
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Posts: 2232




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« Reply #2 on: March 21, 2013, 09:17:09 PM »

I know this doesn't answer the question, but for 10m you might
be better off just stringing up a dipole in your attic. It's easy
and cheap and you won't have to mess with radials.
You won't know how well it works until you try, and it
won't set you back much money.
Good luck with your project.
73, Ken AD6KA
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W5DXP
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« Reply #3 on: March 22, 2013, 05:26:33 AM »

It's 10.5' but my attic is only around 8' high.

A 10m hamstick is around 8' high and is pretty efficient on 10m.
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
W1TLD
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Posts: 41




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« Reply #4 on: March 22, 2013, 08:31:39 AM »

I use a home brew double bazooka in my attic.  Works great on all the bands.  I tunes it with a Palstar at2k.  I didn't have to worry about an antenna ground or radials!  I've had contacts thousands of miles.
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WB6BYU
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Posts: 12985




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« Reply #5 on: March 22, 2013, 08:44:24 AM »

It's probably OK to install it at an angle if you need to, though the exact
results will depend on the specific details of the antenna.

An 8' attic is tall enough to put up a 10m ground plane, using a few wire
radials on the floor and a vertical wire hanging from a rafter with the end
bent sideways to make up the extra length.  That may be easier than trying
to work with a stiff commercial antenna in a confined space, and will work
just as well.

For a standard ground plane antenna, most of the radiation is from the
lower part of the element, so tilting it doesn't change the pattern much.
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