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Our here they have conifera telecommunicensi or whatever. I see from a mile away that those ain't real pine trees.
It is almost the only way. Or drive through town with a cell phone for the respective provider on the dashboard and the field strength displayed.
I have a simple Nokia 2115i. There is a hack on how to get it to display real signal strength numbers instead of dumbed-down bars. But I believe that's it.
The SA44B plus the matching track gen. It's great. Slower and a little iffier than a regular SA but that is not surprise because it's essentially lika a glorified 250kHz SDR with pre-mixer. It's first job was EMC pre-compliance and the final lab plots can in almost exactly on the money, despite my makeshift antennas.