Mostly one sea-lawyer's rant in this group, was that it is illegal to
interfere with any radio signal, etc. That opinion is absent of
understanding the intent of that law, or where it may be applied.

On private property, one may install any device, counter-signal, shielding,
etc that prevent or otherwise render inoperable any other signal that enters
or tries to leave that property. There are reasonable exceptions, before the
crazies ask what about a 1,000' balloon with radar reflector in your
airspace right next to an airport. Get real. We're talking about a
restaurant owner's right to make his interior airspace incompatible with
cellular signals, and nobody can argue he doesn't have the right to do that,
with or without notifying you of it. It's a courtesy if he tells you, tough
luck if he doesn't.

Similarly, the government regulates and (tries) to ensure the operability of
public communications while mitigating unnecessary or malicious
interference. Neither apply to a private property owner's right to have
cell-phone signals blocked on his property. If he invites the public, some
states might pass laws to require he notifies the public of that blockage,
but neither is it the public's right to assume that is so. A locality could
also decide it will prevent cell signals during any venue that takes place
on property it owns or leases. It's reasonable, it's "legal", and it's
happening. Before long, somebody will concoct a way to beat those blockers,
probably by a jam-resistant receiver card that plugs into the phone's
antenna. Then you'll have to check your gun and your cellphone with the
maitri d'. ;-)

Jack
Virginia Beach