You can do this kind of thing yourself with a $10 rtlsdr dvbt dongle, NMEA GPS, laptop and various software. The most commonly used is Eartoearoak&#x27;s rtlsdr-scanner: <a href="http:&#x2F;&#x2F;eartoearoak.com&#x2F;software&#x2F;rtlsdr-scanner" rel="nofollow">http:&#x2F;&#x2F;eartoearoak.com&#x2F;software&#x2F;rtlsdr-scanner</a><p>NW0W has also done a lot of work on mapping powerline interference with rtlsdr dongles in multiple blog posts. An older represenative example is at: <a href="http:&#x2F;&#x2F;blog.dxers.info&#x2F;2015&#x2F;01&#x2F;driveby-system-live-on-road.html" rel="nofollow">http:&#x2F;&#x2F;blog.dxers.info&#x2F;2015&#x2F;01&#x2F;driveby-system-live-on-road.h...</a><p>tautology2 showed his visualization implementation + code over at: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;RTLSDR&#x2F;comments&#x2F;2hbjyt&#x2F;gsm_heatmap_using_rtlsdr&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;RTLSDR&#x2F;comments&#x2F;2hbjyt&#x2F;gsm_heatmap_...</a>