Here are 3 simple receiver converter boxes if the older Tv's do not have ATSC Digital Tv Tuners. At
http://www.walmart.com , RCA DTA800B1 , Sunkey ATB150S , Magnavox TB110MW9.
Here are receivers that will supply signal to the older Tv's , and more Alot More.
http://www.channelmasterstore.com ,
http://www.epvision.com .