I seem to recall the rule of thumb being at least 1/4 wave at the lowest frequency of operation, unless the antenna was specifically designed to be end-mounted to a metal support.

George, KA3HSW

----- Original Message ----- From: "Jerry Felts" nr5ajerry@gmail.com To: amsat-bb@amsat.org Sent: Thursday, August 06, 2009 12:23 PM Subject: [amsat-bb] Elk on tower

How far away from the mast on my tower should I mount my Elk?? The mast is 2" steal anf the lk will be mounted horiz at a 15 deg angle.

-- Jerry - NR5A - South Dakota