On 02/07/2011 21:12, AL_n wrote:
[...] do people receive digital TV signals via old arials?

Yes, very much so. In most (but not all) areas old aerials are (or will
be) fine after the digital switchover. Even when the 'main' TV is on
Sky or cable many people will need a terrestrial aerial feed for their
other TVs.

--
Andy