I had to install a microchip operated cat flap because, for the first time in 20+ years, we had a "stranger" getting in. Our cat hates it. She goes out with reluctance and a leap but thus far has yet to come in, I think due to the projecting "porch" that houses the aerial. This morning she was as usual sitting outside whining pitifully. I held the flap open, and, after hesitating for 30 seconds or so, she actually came through it. Hopefully the start of her acceptance of the new installation.