WG wrote:
... scanners are so poorly put together that they can really screw up the
electronics in the aircraft just by turning it on.

What a load of total crap!

Aircraft avionics are, for obvious reasons, made to be very safe. This
includes a high degree of resistance to stray RF interference.

There are COUNTLESS devices on the ground that radiate FAR more RF
interference into the sky than a handheld scanner would and yet we do
not see planes falling out of the sky every time they get near a
built-up area.