A common belief seen on the web is that if buried radials are not installed over some azimuth sector around a monopole, then the azimuth radiation pattern of that monopole will become distinctly dire
Good point, Dick. There was an AM station is Ann Arbor Michigan with the radials cut in a direction where the staion had too much field strength. The only thing that did was destabilize the array as
Tom, Do you think that radials --either elevated or laying on the ground-- radiate? Or does all of the radiation come from the vertical monopole under the radial system? There is a recent thread abou
There is no question radials radiate, and it is impossible to stop them from radiating or coupling to things around them, at least in the near field. If they didn't radiate or couple, they couldn't
Ok, let's not make this black and white, then. :-) It goes without saying that both halves of the antenna (radials and the vertical) must be present in order for the bottom-fed vertical monopole to r
The number and length of equally-spaced buried radials needed for a monopole depends rather heavily on the conductivity of the earth in which they are buried, and how close the operator needs/wants t
A vertical will radiate without any ground, and actually radiate pretty well if the common mode feedline currents can be controlled and loading losses minimized. Radiation comes from charge accelera
Thanks, Tom. I should have stated that in the absence of radials, the coax will radiate instead due to the common mode current on the outside of the shield. That's a given. Let's forget that I said a
Power is I^2, so we can assume if we divide current between enough radials each radial will not radiate much at any distance compared to the antenna. We not only have cancellation at a distance, we