I have 4 tv's and 2 out of 4 get my local abc channel. I live in oklahoma city and I looked up the channel and I get a strong signal. all my tv's are digital and flat screens, but some are older like 2008ish. and the 2 tv's that do not get the abc are my oldest tv's. How can I get this channel on my tv's? any advice. I just have a basic antenna's.