You'll need to use the NWS version (not as nice, but free to use):
https://radar.weather.gov/ridge/lite/{RADARCALLSIGN}_loop.gif
Replace {RADARCALLSIGN} with the 4 character call sign of the radar site. For my area, it's KMUX so the URL would be
https://radar.weather.gov/ridge/lite/KMUX_loop.gifYou can easily the radar call sign by:
1) open browser to weather.gov
2) search for your town, state
3) note small image at bottom of forecast page, right click on it and "Open image in new tab"
4) the new full image (non animated) is displayed in the address bar.
5) replace the _0 with _loop and you've got the URL.