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High frequency (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters (ten to one hundred metres). Frequencies immediately below HF are denoted Medium-frequency (MF), and the next higher frequencies are known as Very high frequency (VHF). The Shortwave range (2.310 - 25.820 MHz) used by international broadcasters is part of the HF frequency spectrum. In aviation virtually the entire spectrum (2 - 29.999 MHz) is used for HF communications....... for the rest of this article follow this link:


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HF Antenna

HF Antennas
The simpliest antenna for getting on HF and working DX is the dipole antenna. It can be fed with coax line, and the antenna can be placed just about anywhere in any configuration. Ideally the antenna is high enough to be at least one-half wave length above the ground. For 20m, that is about 33 feet.
There is more about antennas, in the antenna section here
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