My ARRL Antenna Book has a formula for calculating the length of a half sloper, L(ft) = 260/f(MHz). Is everyone in agreement with this? I've not tried it, but it seems quite long. Warren Mead VK6MX -- FAQ on WWW: http://www.contesting.com/topband.html Submissions: topband@contesting.com Administrative requests: topband-REQUEST@contesting.com Problems: owner-topband@contesting.com