I have no cable what to get antenna Tv what to do?

No it does not.

I am still using the antenna I fitted 25 years ago and it works fine for my flat tv, most new antennas will say that they are good gor hd tv, internal antennas normally have a cable built in to connect to tv but outdoor / loft ones require cable. Some homes have a wall socket for antenna feed but you need a cable to go from this to the tv.
Hope this helps

If the antenna has a cable like cable wire--hook it direct to the cable fitting on the set.

If the antenna uses the flat type wire (called 300 ohm twin wire) use an adapter that will connect to the end and have screws for the flat wires and a cable slide on the other side to slide onto the cable fitting on the rear of the TV

Before scanning for channel, check to see if the Antenna input is set to Cable or Antenna. If you have rabbit ears or and outside antenna then set it to antenna. If you have cable then set it to cable. Then rescan for channels. If this has already been set then the next step is to check the antenna or cable feed. If possible plug the antenna or cable feed into another TV that is known to be working correctly. If it is capable of receiving digital channels then the problem is likely the Samsungs ATSC tuner and will require service.
If neither TV is getting Digital channels then I will need more info on your antenna setup and where you are located. I am a pro on TV antennas and reception.
Hope this helps
Have a great Day

first of all does your television and/or vcr have a cable connector and/or a set of rca outlets? if they have a cable connection in the back all you have to do is hook the cable from the antenna to the "in from antenna" on your cable box and then connect a cable from "out to tv" to "in from antenna" on the vcr and a cable from "out to tv" on the vcr to "in from antenna" on the tv. then you need to make sure on the converter box and the vcr and look for a channel selector and see what channel they are on. most vcr's have a selector for either channel 3 or 4, look at what channel it is set to and if your converter box has the same thing then match it with the vcr. then tune your tv to that channel and you should be able to work your vcr as long as the vcr/tv button shows that you are on the vcr. now if your tv and/or vcr have rca outlets and your converter box has the same then just hook the cable from the antenna to the cable box and substitute the rca cable for the regular cable and tune your tv to video or line input.

To change between cable and antenna on your TV,
Press Home to display the "XMB" menu.
pick "settings" on the menu
then pick "channel" on the next menu
under channel settings, select "on" for cable and "off" for antenna TV.

Your user manual is available for download and option printing at the following link :
http://129.33.22.12/release/KDL40XBR4.pdf

You need 2 antenna cables. wall socket ----> DVD antenna in and DVD antenna out ----> TV

Check first the antenna using another TV. If there is no other TV available, check using an ohmeter. If you are 100% sure tha the antenna is ok then the antenna connector on your Tv is not making a good connection to the antenna plug.