Interestingly, at very low angles, some radiation from the delta loop is endfire... that is, parallel with the plane of the loop. Delta Loop Optimization At such heights the vertically polarized loops far outperform dipoles or inverted-V dipoles for low-angle DXing, assuming good ground conductivity. metal mast and guy wires on the radiation pattern and impedance of the delta antenna are diffi cult to predi ct analytically, experimental measurements were made to determine these effects. The radiation pattern of these antennas will be same as that of short horizontal dipole antenna. 4 - Vertical patterns and gains for the loop over the dipole antenna at various heights above perfectly conducting ground. To see how big to make our loop at the lowest operating frequency, let's put the loop into free-space and examine some 3-dimensional radiation patterns. Delta Loop for HF - W5SDC T he purpose of the calculator is to give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. You can use a full-wave loop on frequencies higher than design frequency as well (for example, using a 7 MHz loop on 21 MHz), but the pattern will be different. The plots show that it should have very good NVIS performance on 40m and that’s what the aerial was designed for so I’m happy. ½λ vertical with a loading coil. Delta loop
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