## Does an end fed antenna need a counterpoise?

No, it is not needed, but it can improve the antenna system. An EFHW is simply a half-wave length of wire and a matching device, and that’s it. Counterpoises are commonly added to shunt common mode reflections when operating outside of the wire’s resonant frequency to avoid RFI issues (“RF in the shack”).

How effective are end fed antennas?

End fed wire antennas can work very well under many circumstances. They have some disadvantages, but with careful installation, they can work well and be particularly versatile offering multi-band operation.

What is the gain of an end fed antenna?

You can see the gain is 8.5 dBi and it is just a simple dipole just over 1/2 wave high. Any antenna we model should be compared to a standard like a dipole over real earth (unless we intend to install the antenna in outer space)!

### Should counterpoise be grounded?

Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed. The ground must have a low electrical resistance, because any resistance in the ground connection will dissipate power from the transmitter.

How long is a 80 meter end fed antenna?

The length of a quarter wave antenna on 80m is 66 feet which is also a full wavelength on 20m and a half wave on 40m.

How to build an end fed antenna?

Start by wrapping the wire around the toroid. Wrap the first wire around the toroid 27 times (I used a black wire for this).

• Connect a binding post to each end of wire 1 (these are not polarized,so it doesnâ€™t matter which connector is connected to each wire).
• Solder two short pieces of wire to the terminals of the air variable capacitor.
• ## What does dipole antenna mean?

A dipole antenna is the simplest type of radio antenna, consisting of a conductive wire rod that is half the length of the maximum wavelength the antenna is to generate.

What is the formula for a full wave dipole antenna?

The formula for a calculating the length of a full wave loop antenna is: Length (feet) = 1005/f MHz. 544′ is comfortably resonant at 1.847kHz, 3.694kHz, 7.389kHz, 14.779kHz and 29.558kHz. Not an optimal length. 560′ is comfortably resonant at 1.794kHz, 3.589kHz, 7.178kHz, 14.357kHz and 28.714kHz.

What is the use of dipole antenna?

The dipole antenna is widely used in radio and telecommunications.

• An antenna can be used either as a transmitting antenna or a receiving antenna.
• A half-wave dipole antenna is used in radio and television receivers.