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The measurements below are for building a full wave loop using wire . The wire size may range from 16 AWG to 12 AWG . The lower the wire number the greater the bandwidth . For example 12AWG will have a lower swr ( Standing Wave Ratio ) over a greater frequency range than 16 AWG .

The measurments below are in feet and inches . I have rounded off some of the measurments so it will be easier to measure them .
The diagram below is a representation of a ( Full Wave Loop ) . A flat top has a feed point impedence of about 150 ohms .

The yellow line is a one full wavelength antenna .

The red line ia a representation of a support to hold the antenna above the ground .

The orange center is the representation of the coax connection . The center conductor of the coax connects to one end of the continuous piece of wire , and the shield of the coax connects to the other .

The drawing on the left , is when you feed the loop antenna in the center the antenna takes on a horizontal radiation pattren , but when you feed the antanna in the corner , like the drawing on the right , the antenna takes on a vertical radiation pattreen .
The formula for figuring a full wave loop is " length = 1005 divided by the frequency in megahertz .

The formula for figuring the quarter wave coax transformer is " length = 251 divided by the frequency in megahertz times the velocity factor of the 75 ohm coax you desire to use .

Example ;
Length of quarter wave transformer 92FT. = 251 divuded into 1.8 MHZ. (Times) .66 for the RG11 A/U

One end of the coax that attachs to the antenna , and the other end where you install a PL259 connector . From there you may install a barrel connector and any length of 50 ohm coax to get the antenna connected to the tranmitter .
 OperatingsFrequency Full Wave Loop Antenna Length 1/4 Wave Coax Matching Transformer Length( RG-11A/U ) 160 Meters 1.8 Mhz. 558' 4" 92 Ft. 1.9 Mhz. 528' 11 3/8" 87' 2 1/4" 2 Mhz. 502" 6" 82' 10" 80 Meters 3.5 Mhz. 287' 1 3/4" 47' 4" 3.6 Mhz. 279' 2" 46' 3.7 Mhz. 271' 7 1/2" 44' 9 1/4" 3.8 Mhz. 264' 5 3/4" 43' 7 1/8" 3.9 Mhz. 257' 8 1/4" 42' 5 3/4" 4 Mhz. 251' 3" 41' 5" 60 Meters 5.4 Mhz. 186' 1 1/4" 30' 8 1/8" 40 Meters 7 Mhz. 143' 6 3/4" 23' 8" 7.1 Mhz. 141' 6 1/2" 23' 4" 7.2 Mhz. 139' 7" 23' 7.3 Mhz. 137' 8" 22' 8 3/8" 30 Meters 10.1 Mhz. 99' 6" 16' 4 3/4" 10.15 Mhz. 99' 14' 10" 20 Meters 14 Mhz. 71' 9 1/4" 11' 10" 14.1 Mhz. 71' 3 1/4" 11' 9" 14.2 Mhz. 70' 9 1/4" 11' 8" 14.3 Mhz. 70' 3 3/8" 11' 7" 17 Meters 18.068 Mhz. 55' 7 1/2" 9' 2" 18.130 Mhz. 55' 5 1/8" 9' 1 9/16" 15 Meters 21 Mhz. 47' 10 1/4" 7' 10 5/8" 21.1 Mhz. 47' 7 1/2" 7' 10 3/8" 21.2 Mhz. 47' 4 7/8" 7' 9 3/4" 21.3 Mhz. 47' 2 1/8" 7' 9 3/8" 12 Meters 24.890 Mhz. 40' 4 1/2" 6' 7 7/8" 24.950 Mhz. 40' 3 5/8" 6' 7 5/8" 10 Meters 28 Mhz. 35' 10 13/16" 5' 11" 28.5 Mhz. 35' 3 1/8" 5' 9 3/4" 29 Mhz. 34' 7 7/8" 5' 8 1/2" 29.5 Mhz. 34' 0 3/4" 5' 7 3/8"