[UK-CONTEST] OT but Likely I'll get answer....

[Chris Tran]

Hi Adrian

I don't think that open-wire feeders are a solution to your problem. 
Depending on how 'permanent' you believe the installation will be and 
restricting how many antennas are available simultaneously, I would suggest 
that buried coax with a remote antenna switching system is a better option.

This has cost implications, because you would really need LDF5-50A (or one 
of the newer generation of Andrew Virtual Air cables?) - however it would 
not be impossible to accumulate 350m of this cable at reasonable cost, 
provided you have patience.

A useful on-line calculator for coax and other feeders is at 
http://www.ocarc.ca/coax.htm

This gives a matched loss of 1.52dB for 350m of LDF5-50A at 14MHz - 
discounting all connector, etc losses of course.

73
Chris
GM3WOJ