[null and void]

Why do they have radios, but not televisions or telephones?

No telephones because they can talk via floo powder. No television? What good has having television done us?

[Tax-chick]

they can talk via floo powder

Only if they're near a fireplace that's connected to the network.

What good has having television done us?

That wasn't the point. The point is that the wizards use arbitrarily-selected pieces of modern-day Muggle technology. The stuff that's really good - like indoor plumbing :-).