Radar imagery received via ADS-B includes both Regional and CONUS radar, with the update frequency depending on the type of radar and conditions:
Regional Radar (provided by all ADS-B towers): Updated every 2.5 minutes. In clear air conditions (no radar returns), updates occur every 10 minutes.
CONUS Radar (provided by High- and Medium-Altitude tier ADS-B towers): Updated every 5 minutes, but only transmitted every 15 minutes for the contiguous United States.
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