VHS is analog, flat TV are digital. U can only hookup VHS to TV via AV INPUT, If TV has one, else u will need a Composite to HDMI converter.
Because of analog/digital u cannot hookup VHS to antenna input as per before flat TV. Things have changed.
And because of analog/digital (again) you maybe able to playback VHS but not record. The world has moved to DVR for recording.