Symphonic SC313D 13 in. TV/VCR Combo "channel keeps saying signal" Questions

...to TV it keeps saying no signal and or running with a 3 on the screen. it works for me you have to go to menu and keep going and... antenna ... it ghos to channels and sometimes pics up a signal ...

...years in nursing homes with different tv's in every room. Not once have I needed a box to pick up channels with or without cable. I myself get 16 channels with rabbit ears and thats enough for me. ...