An interesting point I noticed modeling a 43 foot vertical was that, while on 10 meters the main lobe is up around 50 degrees, the "gain" at low angles is similar to a 1/4 wave "ground plane" antenna cut for 10 meters. That's because the longer antenna has significant gain over a 1/4 wave antenna so the amount of radiation down at the lower angles is about the same as a 1/4 wave.
That's for a ground mounted 1/4 wave on 10 meters. Ideally you want to raise the 10 meter vertical at least 1/2 wavelength - roughly 16 feet - then you get much better low angle radiation from the 1/4 wave because the ground absorbs much less of the lowest angle radiation. Installed that way, the 1/4 wave shines over the 43 footer. Also, of course, there is less interference with the signal by foliage, buildings, etc. That's why so-called "vertical ground plane" antennas are so popular on the higher HF bands. 73, Ron AC7AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
