You've probably seen cable-TV installations where the bare
coaxial cable simply enters a room via a crude hole
drilled through the floor or a baseboard (maybe you've
seen them in your own house!). They're functional but not
too decorative. For a more finished and permanent
installation, do the job right and install a bona-fide
wall jack.
Make a cutout opening 1 1/2 inches wide and 3 3/4 inches high at
the television-jack location. Pull the cable through the
opening, and install two television-jack mounting brackets
in the cutout.
Use an
adjustable wrench to attach the cable F-connector to the
back of the television jack. Then attach the jack to the
wall by screwing it onto the mounting brackets.