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Discussion in 'CB Antennas' started by BammBamm, Mar 13, 2012.
20 ft = SQRT(2 x 20) = 6.245, then 6.245 x 1.15 = 7.27 Miles
53 ft = SQRT(2 x 53) = 10.3, then 10.3 x 1.15 = 11.84 Mile
That's an increase of 11.84 - 7.27 = 4.57 or 4.6 Miles roughly.
If you're on a hill overlooking the area, the range will be greater. As stated before, this is a rough estimate and does not take into account terrain losses which could increase or decrease this estimate.
i ask because i talked much farther than 12 miles on a 3 ft little wil 9 ft to the tip .
Every time you raise the antenna a full wave length
(for 11 meters or cb .. that is basically 33 ft per wavelength_
Originally you had 20 ft hight..
You can add an additional 33 ft ( or a wavelength for 11 meters)
You should on receive get at least a Db addition to what you had been receiving (and same for transmitting )...
but locally.. for skip for transmit or receive you can not know for sure what gain you will have .. Although typically you will naturally get out and hear better when able to raise your antenna higher
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That formula sounds more for calculating tower to tower positioning.
It also optimizes DX:
Antennas Elevation Angle in Degrees
1/4 wavelength long 28 (15 - 40)
3/8 wavelength long 23 (12 - 35)
1/2 wavelength long 18 (09 - 25)
5/8 wavelength long 12 (07 - 18)
1/8 wavelength long above ground 90 (55 for lower 3db point)
1/4 wavelength long above ground 60 (38 - 82)
1/2 wavelength long above ground 30 (18 - 40)
3/4 wavelength long above ground 21 (14 - 28)
One wavelength long above ground 17 (09 - 19)
1/4 wavelength long above ground 43 (32 - 54)
1/2 wavelength long above ground 30 (18 - 38)
3/4 wavelength long above ground 21 (13 - 28)
One wavelength long above ground 17 (09 - 18)
I agree that raising an antenna will lower the radio angle, but nothing special happens at 36'.
Damn, I wish I could understand this graph. It looks like some one transmitting at the North Pole and the signal is being sent east against it's will.
How much improvement will be seen by raising/doubling the height of an antenna? If you can ever quantify that for any particular band you could make a fortune. Unfortunately, there's no way to predict that sort of improvement, how much it'd be, just way too many other things affect reception than just antenna height. I think you would be safe in thinking that it would be a noticeable difference. After that, your guess is as good as anyone else's.
I agree about the 'wave length' theory, don't put much faith in it. If done correctly, an antenna will work okay mounted at ground level. The higher you can go with it (done correctly) the better that "okay" becomes.
Do it, then you can tell us how much it improved things!
agreed,............. I have a 6 meter quad on a hazer, and often there is a marked difference when I run it up or down on the electric winch.
but, thats 6 meters, one of these days I'm gonna put an HF antenna on the hazer and play with it<<More audio>>
Sooo - DX 'tuning' depends on what freq is used, type of antenna and its take-off angle, and how high you put it up.
Food for thought.