missing local channel

[Squall10]

I bought recently a samsung smart tv and i put an extension direct tv cable without the box on it and i get all the local channels. Yesterday while i wacthing the playoff all the channel are gone and says "no signal or check the antenna." Sorry for my english hope you understand my mother language is french. Please help.

 

[hang-the-9]

If you checked the inputs to the TV, made sure it's on the right source and rebooted the Direct TV system, contact Direct TV.