On Wed, 03 Mar 2004 13:48:12 GMT, " Stephen Cowell"
wrote:
[snip]

Yes... you can ground the antenna, in fact,
it is recommended.

There is one problem not often mentioned with connecting a j-pole to a
ground mounted conductive mast. It can increase the amount of higher
angle radiation. Mast lengths that are multiples of ½-wavelengths are
the worst for this problem and mast lengths that are odd multiples of
¼-wave produce the least.

If the mast is not grounded (floating) then the situation is reversed,
½-wave would least high angle radiation and and ¼-wave the most.

NEC modeling has shown that for good low-angle radiation patterns
insulating a j-pole from a conductive mast produces more power towards
the horizon.

73,
Danny, K6MHE