I documented in a previous post my homemade RTK base station for less than $1,000.  In reality I'm probably just over $1,000 but its still affordable.  Yesterday I moved my antenna and receiver to a 6' tall post in my yard that has better visibility and less chance of being hit and/or damaged.  At the same time I installed a calibrated antenna from Ardusimple instead of the Trimble AG25 I'd been testing with.  And then I could not receive any corrections on my test devices.  I've since figured out that if I change the antenna type back to a Trimble Zephyr or None on my receiver board everything works.  I was under the impression that antenna descriptor didn't matter but I do not know what is contained in a calibration file.  Can I over ride this somehow?