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The remote operates in the 433.050 - 434.790 MHz range, so an optimal 1/4 wave antenna would be 6.802 inches. Seems small, but according to antenna theory, that's the ideal size. Then again, if an antenna of that size would be blocked by metal, you might get more practical range by using a random length of wire that has more "visible" openings between the various metal parts in the dash. You could try using a full wavelength, which would be 27.207 inches.
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