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Technically a true "longwire" needs to be at least one wavelength long. but Hams commonly call any end-fed wire a longwire or more correctly random wire antenna. Figure 1 Typical ATU and long wire antenna configuration with an earth or earth plus counterpoise.
Antena „Long Wire” (LW) jest rzeczywiście najprostszą anteną wielopasmową o niekrytycznych wymiarach. Aby używać jej z powodzeniem trzeba jednak zadbać o uziemienie i dopasowanie. Budowa anteny LW. „Long Wire” (LW) to antena utworzona przez pojedynczy przewód zawieszony w wolnej przestrzeni, dołączony
The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes ...
A VHF rubber ducky or whip antenna used directly on a hand-held transmitter with no coax cable. A “random length” wire, the length of which is sometimes carefully selected to be non-resonant on any of the bands of operation, so it really isn’t very random.
1. Keep your antenna far away from power lines! If you, your antenna or your ladder touches a power line, you could be KILLED. 2. Remember that you will be climbing ladders or trees to high place. Observe every safety precaution.
With very long antennas, the weight of the wire and feedline, center insulator etc, causes some sizes of wire to sag in the center. If this is the case with yours, some support in the center may be needed by attaching another support rope to the center insulator.
Our first pick is the non-resonant end fed antenna. This antenna is great because it’s affordable and easy to install – all you need is a tree and some space! Also called the End Fed Long Wire, it’s a cable attached to a 9:1 balun that will use part of the feedline coax to radiate.
