HF  PROPAGATION Good knowledge of the propagation of radio waves and procedures when making connections are very important. The weather is an important factor. Here is some more information about propagation and the sunspot cycle prediction.  There are a number of layers in the ionosphere. Two, there are important: the lower-layer D, which mainly absorbs the low frequencies, and

This antenna is a full wavelength single-delta-loop, with the point of the triangle at the top of the single support pole, and fed near one of the corners – One Quarter Wavelength down the diagonal leg.  Feeding and matching is simple;  it’s fed with a quarter-wavelength of RG-11 or RG-59 (75 Ohm) coax, and then any length of

Many thx for DJ0IP (Rick) & ARRL for contribute this subject! (A) Coiled Coax Choke The coiled coax choke is the easiest to make but also the least effective. If it works, use it. Otherwise use something better. For details see the ARRL HANDBOOK or ARRL ANTENNA HANDBOOK. Scrambled-Wound Choke?  OK or not? I honestly do not know

01 – Tee Antenna 02 – Half-Lamda Tee Antenna 03 – Twin-Led Marconi Antenna 04 – Swallow-Tail Antenna 05 – Random Length Radiator Wire Antenna 06 – Windom Antenna 07 – Windom Antenna – Feed with coax cable 08 – Quarter Wavelength Vertical Antenna  09 – Folded Marconi Tee Antenna 10 – Zeppelin Antenna 11