Ummmm... I think we're using a figure of about 30 ohm - meters for concrete. Eric, K6GV edwoods@pacbell.com ---------- > Does anyone know the conductivity of concrete? -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com