The performance of an antenna, and in particular its radiation pattern, is therefore difficult to visualise, interpret and measure in an objective way. Nevertheless, the propagation of electromagnetic waves is greatly influenced by surrounding objects and media. Pulse-King-Pulse-Tech-Fuel-font-b-Saver-b-font-font-b-Battery-b-font.jpg]] var lpix_1=pix_1.length var p1_0= [[528' alt='K6sti Yagi.Įlectromagnetic waves are in a sense a bit mysterious: You cannot see them, not smell nor touch them.
I have been an active ham since 1963 but up until 1994 had not been active on the sixmetre band. For the same spacing, gain increases to 2.1 dB with the upper antenna at 40 feet, and to 2.3 dB at 50 feet. For example, with one Yagi at 30 feet and the other 116″ below, the spacing that maximizes stacking gain in free space at 3.1 dB, gain at 1° elevation over the upper antenna alone is only 1.6 dB.
