Also, with the variation of the readings, check for line of sight obstruction, twigs,limbs,etc, by sighting down the arm from behind the dish and see if anything could be blowing into the line of sight. Doesn't take much to mess the signal up. I've seen just 1 small twig in the LOS make a difference. Also check that the connectors are at least finger tight. (1 on the modem, 2 on the ground block, and 1 on the radio. Best to unplug power from Modem first to avoid any radio Radiation.
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