MARC - Cincinnati's Club For Amateur Radio - 147.345+

Propagation & Grayline


Propagation Links

Amateur Radio Studies
hfradio.org Studies
DX Zone
Near-Real-Time MUF Map

Grey Line

by 5B4WN

Here is a Gray Line Map that updates in real time and lets you move the time forward/back.

Grey Line

by John Walker

Often, propagation becomes excellent along what is known as the Gray Line. This image gives you the current view of where daylight is bordered by darkness. The Gray Line is that shade area along the entire boundary between night and day. See John’s website for more information about Astronomy and Space .