I have a Bravia KDL 46EX500. I have always had cable until now. I went in and set it to antenna and went through the auto channels and it found none. Continues to say "no signal". When I use a digital converter box and put the tv on channel 3 I at least get a weak signal message. Any suggestions? I am sure I have left out details so please don't hesitate to ask. Thanks in advance!