A popular (and interesting) listening option in the 1970’s were the AM VOLMET weather broadcasts from, well, everywhere… they were low powered (typically 5 kw or less) and hearing them from a great distance was quite the thrill. Most common on the West Coast was Honolulu, Tokyo, Hong Kong and (I think…) Bangkok Radio… heard most mornings. Here are a couple of less heard ones from the West Coast; NY Radio and Gander Radio from Newfoundland.

These broadcasts are still on the air (link)- different frequencies and single sideband as opposed to AM.

This capture was from September 1975 on my trusty DX150B with one of the many dipoles I had - this one likely a 25 meter 1/2 wave dipole.

Image below is a QSL card from Shannon, Ireland - this was a VOLMET weather-cast that was audible here in the West Coast quite frequently.