I have a cat door that reads the cat's microchip before letting her in. The brand is SureFlap. You could probably find out about the antennas they are using thr

I have a cat door that reads the cat's microchip before letting her in. The brand is SureFlap. You could probably find out about the antennas they are using through FCC filings: https://fccid.io/XO9 https://fccid.io/XO9