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Spong, thanks for the explanation and the pic. That looks like it could definitely be useful. The ~60 Mhz span in my pic was just a value I selected for the best view of those signals. The Airspy can display a range up to ~1.7 GHz (see below). Not much value in going that wide as near as I can...

Spong, I'm not an expert on the subject but I believe the Airspy device can be categorized as an SDR device -- it just seems to be on the higher-end of things. I tried one of those $25 dongles but wasn't able to observe the OTA TV spectrum. Do you know of one that works? I'd be interested in...

I'm late to this thread but thought I would toss out this option: If a laptop is available, there's a nice USB device that will allow for spectrum analysis. It's from Airspy, and sells for about $170. Plug in it via USB and then run the free software available on their site. See attached for a...