Antennas By N6LF

An example of the effect of tower coupling on an array

It's well known that a nearby tower can affect the performance of a vertical array but I haven't seen any articles which give an actual example.  Last fall I made such measurements on an 80m 4-square which clearly show just how bad the interaction can be.  Attached is a summary of those measurements: Download NK7U array tests 7 Oct 08 .  This file is about 73 kB.

Vertical-tower interactions

Interaction between a vertical and a nearby tower can be a very real concern.  I have done a short NEC modeling study on the subject which sheds some light on the subject. It's far from complete and I will no doubt expand it in the future but I have received a number of questions on the subject so here is the study in its present form.  Download Tower coupling study  The file is approximately 250 kB.