Replying to Avatar Bill Cypher

7mhz is nvis possible. Predictable 400 ish mile circle if I remember correctly. That is mostly at gray-line though. 7mhz will come and go depending on solar activity and time of day though. Roughly 40m band but ISM.
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shortwavesurfer2009 6mo ago

Here's a cutout from what Nano-GPT.com told me.

"Ionospheric Conditions: The ionosphere's behavior can vary significantly with solar activity and time of day. During periods of high solar activity, the ionosphere can reflect higher frequencies, making NVIS possible on the 40-meter band. During the night or during solar minima, the ionosphere may not reflect 40-meter signals effectively."

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