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11 meter dipole

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mmckenna

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Sure. I've got a neighbor down the street with a dipole set up like that.

Some things you want to look out for, though:

If you roof is metal, or there is any metal structure under the roof, you'll want to make sure you put your antenna high enough above it to prevent interaction between them.

Support the coax well so it's not pulling on the center too hard.

A dipole is going to be bi-directional, in other words it's going to work best broadside to the antenna.
If you've got the space, time, money, set up to dipoles with a coaxial switch. Put the dipoles at 90º to each other and you can switch between them and see which one works best for the specific conditions.
 
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Québec canada
Sure. I've got a neighbor down the street with a dipole set up like that.

Some things you want to look out for, though:

If you roof is metal, or there is any metal structure under the roof, you'll want to make sure you put your antenna high enough above it to prevent interaction between them.

Support the coax well so it's not pulling on the center too hard.

A dipole is going to be bi-directional, in other words it's going to work best broadside to the antenna.
If you've got the space, time, money, set up to dipoles with a coaxial switch. Put the dipoles at 90º to each other and you can switch between them and see which one works best for the specific conditions.

thank you very much my freind
 

wyShack

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another thing to keep in mind is what is commonly known as polarization. A dipole radiates a horizontally polarized signal. Most CB antennas are vertically polarized. At 27 Mhz, the 'loss' caused by cross polarization is over 20 DB-or several S units. Back in the day, some beam antennas (like the Moon Raker) allowed the user to switch from vertical to horizontal. for local work using SSB you can almost 'share' a channel with one group horizontal and one vertical. The big problem is horizontal antennas at 27 Mhz are way to 'cumbersome' for a mobile.
 

prcguy

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If the OP is more interested in long distance skip then the dipole will work fine, plus it will reduce some local vertically polarized stuff. You won't see 20dB of difference between a horizontal and vertical CB base antennas due to reflection and refraction, but you can get 30dB or more cross pol isolation when pointing up to a satellite where there is nothing to corrupt the signal. I had some high end antenna feeds for antenna range testing that were rated at 40dB cross pol and that is about the limit you can acheive.
prcguy

another thing to keep in mind is what is commonly known as polarization. A dipole radiates a horizontally polarized signal. Most CB antennas are vertically polarized. At 27 Mhz, the 'loss' caused by cross polarization is over 20 DB-or several S units. Back in the day, some beam antennas (like the Moon Raker) allowed the user to switch from vertical to horizontal. for local work using SSB you can almost 'share' a channel with one group horizontal and one vertical. The big problem is horizontal antennas at 27 Mhz are way to 'cumbersome' for a mobile.
 
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