Recommendation. For best results, dipoles should be at least 1/2 wavelength above ground level. For the lower bands, especially 160-40 meters, this can become impractical–place your dipole as high as your situation allows.
How high should a 10 meter dipole antenna be?
I can work “locals” on 10m out to about 100 miles or so using a beam at 55 feet above ground, and aiming it at those stations. With a low dipole, about 15 miles. With a vertical, it varies a lot depending on the polarization of the other station.
How high above ground should a transmission antenna be set?
A height of 120 feet or even higher will provide even more advantages for long-distance communications. To a distant receiving station, a transmitting antenna at 120 feet will provide the effect of approximately 8 to 10 times more transmitting power than the same antenna at 35 feet.
How high should a 40m dipole be?
So, what does a 40m dipole consist of? Well, 66 feet of wire, split in the middle. You can use pretty much anything for wire as long as it’s a good conductor.
Do dipole antennas need to be grounded?
Current through this uncontrolled parasitic capacitance represents radiation. Therefore, a dipole antenna requires two parts in order to radiate and the amount of radiation will be proportional to the dipole current. Note also from Figure 2 that, a dipole does not require a “ground” to work.
What antenna is best for 10 meters?
A typical full length 1/4 wave antenna for 10 meters is something on the order of 100 inches, give or take a few. A dirt common 102″ whip should work okay, just need to trim it a little. As for gain, forget it. For there to be gain the length of a single antenna doubles.
Does the height of an antenna matter?
In general the higher the antenna the better its performance will be, but sometimes there are some limits as there is a law of diminishing returns, but often this is outside the reach of amateur radio users but sometimes broadcasters will want particularly high antennas to gain the required coverage at VHF and UHF.
Does antenna length matter for reception?
So the answer is yes, size does matter, but bigger isn’t always better. It all depends on what your transmitting and receiving frequencies are. Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency.
Can an antenna be too long?
If you use an antenna which is “too long” or “Too short” for the frequency, it will not resonate, HOWEVER if you use an “Antenna tuner” you can usually electrically tune the antenna to cancel out the reactance and make the antenna resonate at the frequency in use.
Will a 40m dipole work on 15m?
Divide the 40m dipole by 3. There are two “hot points” both sides from the centre some 3.4m apart. They are “hot” only for 15m, and pretty “cool” for 40m. It means that if you connect short wires to these points, the resonance will move well down on 15m and move down verry verry slightly on 40m.
How long is a 20 meter antenna?
Read more about . . . . Dipole Length Calculations.
|Approximate Lengths for HF Ham Band Dipole Antennas|
|Band (MHz)||Length (Feet)||Length (metres)|
|7.0 MHz (40 metres)||68.5||21.1|
|10.1 (30 metres)||47.5||14.7|
|14.00 (20 metres)||34.3||10.6|
Is a balun needed for a dipole antenna?
Paul, a dipole does not *have* to have a balun. Having one may help prevent RF from coming down the line into the shack and may improve the radiation characteristics of the dipole, but I’ve run dipoles connected straight to coax without a problem. Put one up without a balun and see how it works for you.
Does antenna need to be grounded?
Do I Need to Ground my Outdoor Antenna? Yes, all outdoor TV antennas should be grounded. Even if you have a newer plastic antenna, there is metal inside. Furthermore, TV signals are made of electricity.