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To find my several Part 15 usable frequencies I have used several methods, with a three page list of all FM frequencies periodically updated with current occupants within the 2-state area around my location.
To start the list, the local stations and their ERP (effective-radiated-power) gets typed in, which leaves the spaces in-between them as hunting ground.
Next, stations and powers in cities all around the 2-state area, especially seeking those that are farthest away or which have low power.
Using the list I then tune on a sensitive FM radio and…
Observe the FM band on a spectrum analyzer, watching for wide areas of “no signal.”
I have used the radio-locator frequency finder, and noticed that it did NOT suggest some of the good channels I was able to find, and some of its suggestions were among those I rejected.
Radiolineup is new to me, thanks for telling about it.
Within recent months many new translators have come on, some older translators have moved to different frequencies and tower locations, and one or more LPFMs have appeared, so I’ve had to move a few times.
Things are fluid for FM right now, the bus is crowded.
In the starting years I remember when only 3 local FMs were on in the daytime, only 1 at night, and after midnight nobody.