If they used the hash marks on the highway then they were using a stop watch and a lookup chart, not radar. There are air to ground radar systems but they are very expensive so not sure how prevalent they are outside of the military.
Either way, if you appeal you are entitled to discovery. File a motion with the court for the state's evidence, if they fail to produce the evidence then it is likely that your case will be dismissed. The evidence will allow you to do additional research into the potential accuracy of the speed measurement, and allow you to challenge on certain grounds.
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