Random Wire Antennas
Accessed on 21 June 2017, 23:50 hrs, UTC.
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Random wire antennas have been around since the dawn of Amateur Radio early in the 20th century. Properly designed and attached to a suitable ground radial or counterpoise system, a random wire antenna will perform well and give you many contacts on Field Day or any other portable operation.
This article from the ARRL, gives you all the information you need to make a simple, inexpensive, and efficient random wire antenna.
The best length of a random wire antenna seems to be around 1/4 wavelength of your chosen band. If you want to operate from 80 through 10 meters, make the wire length to accommodate the 80 meter band (around 135-feet/41.158 meters). For multiband HF use, an antenna "tuner" and a ground radial/counterpoise system are required.
According to the ARRL, a counterpoise or ground radial system supplies the "missing half" of your antenna and will do a lot to reduce RF in the shack: