[TowerTalk] halfwave slopers

[jim Jarvis]

Roger,

The K8UR array of sloping dipoles around a central tower does,  
indeed, work.
You should be able to net 3dB gain out of it, with 4 antennas.    The  
scheme of using
3/8 wave feedline to a central switch, resulting in the unused  
antennas becoming
reflectors, also works.   (* make sure the coax shields are floating).

I've never modelled the array, but have read at least one report that  
folding back the
lower quarter waves to the tower causes the vertical angle  
distribution to be lowered.

As an FYI,  W2GD's 160m contest site, at the Jersey Shore, uses TWO  
dipoles folded
back on themselves, with a delta loop reflector in the middle.   One  
is aimed at EU, the
other to the west.   Plays well.   So variants on the original k8ur  
design also work.

73/N2EA

Jim Jarvis, MBA
President-Executive Coach
The Morse Group, LLC

People-Process-Strategy
Achieving Results in a Changing World
www.themorsegroup.net