I haven't seen any tablets with a built-in radio (FM/DAB) or TV tuner.

Are there any about?

Nearly all mobile phones these days have an FM radio.

Sometimes it's not possible to use the internet to listen to a radio stream or watch TV.

BTW: I know DAB and TV would use a lot of power...

Doubt we’ll see a TV built in as then you need to build in an aerial as well and a TV tuner and I can’t see anyone wanting a chunky tablet.

I am surprised by the lack of an FM radio though because as you say most phones do.

It will also make the devices heavier. Mobile phones don't have FM radio either. The headphones act as the antenna.

You can buy an add-on. This for example is coming. Don't think they're cheap though.

I had a gigabyte T600 mobile phone with an in built free view tuner
http://www.youtube.com/watch?v=KtoKt...feature=relmfu
was a great little phone, ok it wasn't a tablet but it had a touch screen, the usb charging point broke off the board inside..I still have it somewhere I will dig it out one day and see if I can repair it once i have some free time