Map of ground conductivity https://www.fcc.gov/media/radio/m3-ground-conductivity-map 73 Phil K2RRX Sent with [Proton Mail](https://proton.me/) secure email. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/w2cra/attachments/20230908/507b4c5b/attachment-0001.html>