I read on this Newsgroup once a while back, where someone posted what length
of wire for each frequency was needed to obtain the optimal reception.Can
some repost this info?Thanks in advance...

On Tue, 29 Nov 2005 09:33:04 -0500, "Jake Steed" wrote:

I read on this Newsgroup once a while back, where someone posted what length
of wire for each frequency was needed to obtain the optimal reception.Can
some repost this info?Thanks in advance...

Since there is an infinite number of frequencies, how about we do this the easy
way instead of posting infinite wire lengths to match? :-)

To calculate the length, in feet, of a half-wave dipole antenna simply divide
the number 468 by the frequency in MHz.

To calculate the length, in feet, of a quarter-wave vertical antenna simply
divide the number 234 by the frequency in MHz.

It should be noted that these equations include a factor to account for end
effects and is generally not as accurate for VHF/UHF antennas.

Hope this helps...

John Kasupski, Tonawanda, New York
Amateur Radio (KC2HMZ), SWL/Scanner Monitoring (KNY2VS)
zIRC #monitor Admin

In article ,
"Jake Steed" wrote:

I read on this Newsgroup once a while back, where someone posted what length
of wire for each frequency was needed to obtain the optimal reception.Can
some repost this info?Thanks in advance...

The length of wire will change depending on the antenna type so you
will need to be more specific. If you meant to ask about a single wire
antenna then the answer is a 1/4 wavelength for the frequency of
interest.

The single wire antenna needs a RF ground to be effective so use a
ground rod or lay another wire on the ground under the single wire
antenna. You can improve the the wire performance with an UNUN coax
cable to wire impedance adapter at the RF ground rod.

Usually single wire antennas are not cut to a specific length and as
such are loosely defined as random wire antennas. Use a wire from 75 to
300 foot long for a table-top type radio and no more than 75 feet for a
portable radio or you may over load it.

--
Telamon
Ventura, California

JS - This may help - iane ~ RHF

Shortwave Listening (SWL) Frequency Bands

SW Meter Band -- One Wave - - 1/2 WL - 1/4 WL - - Loop
Center Frequency----Length - - - - Feet - - - Feet - - Antenna
SW Band = MHz - - -K984.0 - - - -K468.0 - -K234.0 - -F1005

120 Meter = 2.40 - - - 410.0 - - - - 195.0 - - - 97.5 - - - 418.8

90 Meters = 3.30 - - - 298.2 - - - - 141.8 - - - 70.9 - - - 304.5

75 Meters = 3.95 - - - 249.1 - - - - 118.5 - - - 59.2 - - - 254.4

60 Meters = 4.91 - - - - 200.6 - - - - 95.4 - - - 47.7 - - - 204.9

49 Meters = 6.08 - - - - 162.0 - - - - 77.0 - - - 38.5 - - - 165.4

41 Meters = 7.35 - - - - 133.9 - - - - 63.7 - - - 31.8 - - - 136.7

31 Meters = 9.55 - - - - 103.0 - - - - 49.0 - - - 24.5 - - - 105.2

25 Meters = 11.9 - - - - 82.7 - - - - 39.3 - - - 19.7 - - - 84.5

22 Meters = 13.72 - - - - 71.7 - - - - 34.1 - - - 17.1 - - - 73.3

19 Meters = 15.45 - - - - 63.7 - - - - 30.3 - - - 15.1 - - - 65.0

16 Meters = 17.69 - - - - 55.6 - - - - 26.5 - - - 13.2 - - - 56.8

13 Meters = 21.65 - - - - 45.5 - - - - 21.6 - - - 10.8 - - - 46.4

11 Meters = 25.85 - - - - 38.1 - - - - 18.1 - - - - 9.1 - - - 38.9

Telamon and RHF are both right.(within reason,unless you want to grow an
antenna farm in your back yard) www.devilfinder.com Calculating
the correct lenght of shortwave radio antenna wire for each frequency
cuhulin