Since the currents on the vertical parts of the radiating system (vertical wire and tower) are approximately in quadrature, you might expect a cardioid-like pattern—and this is what EZNEC predicts. This is 1005 divided by whatever frequency you are going to talk on. The figure given above shows radiation pattern of a dipole antenna. REPORT ON ANTENNA DESIGN, SIMULATION AND FABRICATION This null progressively fills in as one makes the loop diameter larger. father's day message to husband But it is greater than 1λ on 40M and above. Half Delta Loop Antenna - Radio Electronics 1997-08 I verified the narrower inner angle of the bottom corner gives smaller resistance for the delta loop antenna. Horizontal Wire Loops 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. For receiving … 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. --Leonard WB3AYW. To get the answer to these questions, we will examine the radiation patterns of the 80 meter loop on all the bands. It could be very good in the direction of the slope, even when its only 25 ft off the ground. Fig. The Double Delta Antenna - Radio Amateur 11-1972 DELTA LOOP (27DL3) raamant Horizontal Quad Antenna Full Wave Loop Antenna - IW5EDI Simone - Ham-Radio The 40m dx Delta-Loop is a winner. Loop antenna layout and radiation? - Amateur Radio Stack Exchange