I am planning the installation of a Rohn 25 tower as a 1/4 wave 160m vertical. There will be an adjustable 10' aluminum mast on top to resonate the tower on 1830 khz. How tall must the Rohn 25 be to be resonant? (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/topband.html Submissions: topband@contesting.com Administrative requests: topband-REQUEST@contesting.com Problems: owner-topband@contesting.com