Apple TV killing aerial signal

[SlidingSideways]

Anyone encountered this?
Only certain channels, and they're absolutely fine until the ATV is powered on.
I've tried switching the HDMI cable and bought new shielded WF100 leads to connect the TV and YouView box to the socket, all to no avail.
ATV is wired to the network, although I can't see any way of explicitly disabling it's wifi.

[Tony1963]

I've had Apple TV, 2 and 3, for around 5 or 6 years now, never had any problems at all. No Sky, just freeview and blue ray player.