Map of United Kingdom digital terrestrial TV (DVB-T) coverage at 490MHz (Ch23 PSB1, BBC MUX).
Green represents a strong signal up to -50dBm, blue is a weaker signal up to -90dBm. Actual coverage may vary due to environmental variations.
This layer was created from 1150 distinct sites in under two hours using the Python client and API. It required the Ofcom OSGB grid references to be converted to decimal lat/lon pairs and the Kw values to be transformed to watts before being pasted into the CSV format ready for processing. Resolution was kept deliberately low at 600 pixels per degree given the large scale of the layer. Radius for each site was kept at a consistent 40km - clearly this varies by site and ERP but during trials 30-40km was identified as an average range of DVB-T towers. As a broadcast system, DVB towers are spread more evenly than GSM towers which cluster in cities. The DVB frequency range is vast and propagation results will vary accordingly but the best range and obstacle penetration is to be had at the lower end - which is presumably why the BBC picked it. More obscure channels are found towards the higher end of the DVB spectrum which is a bad place to be these days with 4G interference at 800MHz.