A friend of ours put one of his gate cards into his drivers side mirror (between the mirror glass and the outside of the mirror housing). He then taped it so it wouldn't come out. When he pulled into a gate, his driver side mirror was just about the same height and the gate box and the unit would read his card through the mirror housing. He said it worked for almost every gate entrance except for one or two where the gate box was a little too low for it to read from his mirror. On those few, he had his extra gate card handy or he used the button. But every time I was with him, it worked great and he didn't have to roll down his window.
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