On Sun, 09 Apr 2006 13:18:18 GMT, ml wrote:

hi


i've noticed a few installations of say a 2m beam vertically mounted to
a regular metal tv style mast

from looking at it, you have the mast(metal) going between 2 elements
and longer than the elements

so i was wondering as this is a common mounting style and method

how bad is the beam pattern for rx and tx ? effected by the metal mast?



it also got me thinking i've noteced some beams as in the above use a
fiberglass boom while others use metal

how does this effect patterns and efficiency

both from a practical point of view and technically speaking

The metal mast affects the performance to some degree, but I don't
know of a rule of thumb for predicting it. So the answer is, it
depends.

A fiberglass or other non-metallic mast will help, it you also use a
non-metallic coax line.





???


thanks