Main channels cost too much money. You are always better off with the cable channels. Much more bang for the buck. Also, viewership has been moving away from the big 3. Fox is doing very well.
Might i add that I have spent hundreds of thousands over the years for advertising. Tv, radio, reach advo, valpack etc. etc.
My personal motto is: early to bed, early to rise, advertise, advertise, advertise.