In article , Ian Jackson
wrote:

Irv,
Have you any idea about the lengths which cable TV operators go to to
keep their networks RF-tight (ingress and egress)? Feed an outlet into
antenna? Maybe not such a good idea!!

Ian-

In that case, why not get the Cable TV people to install it for you? They
can use an isolation amplifier that will prevent outside signals from
being fed back into their system.

Fred