To watch TV you will need some sort of satellite reciever installed...
Regarding the issues between the front and rear tvs I would contact Lucie at DVD in Motion. They have always been extremely helpful with any troubleshooting.
Just my $.02
2013 BMW M5
2011 BMW 750i M Sport w/ HRE 948R - Retired
2011 Infiniti QX56
'73 VW Dune Buggy