We offer several resources here relating to over-the-air (OTA) broadcast services (TV, FM, and others). We have a variety of online tools, downloadable content, reference information, and discussion forums to help users learn, understand, and make informed decisions about the OTA services available to them.

The Signal Analysis Tool lets you enter a location by address or by coordinate, and optionally the height of an antenna above ground. It then runs 3D propagation models for the exact location and height and generates a "radar plot" report that summarizes the signal strength and direction of all the channels in the area.

A tool to converts images to IQ streams that are visible when viewed in a waterfall plot.

RTL-SDR based spectrum analyzer.

Analyze spectrograms created by rtl_power.

Signal hunting software. Written in Python. Has a local database of signal types, signatures, and matches. Has a collection of filters to refine picked up signals. You have to register on the forums to download it but it's otherwise free as in beer. GPLv3.