Amateur radio hobbyist LA3ZA shows an image on his blog showing how busy the 70cm ISM band can be in his area in Norway. He uses a roof mounted 1.7 m long vertical antenna with 7.2dBi gain in the 70 cm band. Each signal burst may come from a remote car key, weather monitor, electricity monitor, or other telemetry device. Some of these signals may be decodeable with rtl_433.
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