My RF Technology column in the January 2026 TV Technology magazine described how TVStudy and QGIS can be used to analyze and map TV and FM radio station coverage. The TVStudy output and other files here can be downloaded, dragged, and dropped into QGIS. If you run into problems or need help, email me - Doug Lung, dlung@transmitter.com
The files here were created using the default settings and 11/17/2025 LMS data for WDMR-LD in Springfield, MA. This station was chosen because it receives significant interference outside the Springfield area which most on-line coverage maps will not show. Download the KMZ file and open in Google Earth to see detailed coverage and interference data. Display "Study Points", zoom in, and click on a pin to see detailed information about that cell. Download and extract all files from the shape.zip file into a directory to plot contour and coverage information in QGIS. When you drag the file with the .shp extension into QGIS, it will find related files with the same name in that directory. The tvixstudy.txt file shows the predicted coverage and interference to and from WDMR-LD.
These files provide some basic components for a map of the U.S. in QGIS. Download the Map Items zip files and drag and drop them into the layers window in QGIS.
Download the qml_styles.zip file and extract the qml files. Once downloaded, double click on a layer name in QGIS Layers window. In the Layer Properties window that opens, at the bottom of the page click on the Style button and select Load Style... In the Database Styles Manager click on the ... to the right of the File box to open a file selector. Double click on the appropriate qml file and it will appear in the File box. Click Load Style at the bottom of the window and it will close. Back at the Layer Properties window, click Apply. You can select features to change from the menu on the left of that window.