What is the name of the lead that fits into an old style television aerial?

Plug - Belling Lee connector. One of the worst plug designs EVER - in the standard design, the cable braid conncts via a clamp when screwed down, but the inner needs to be soldered, and the insulator softens easily. There may be alternataives which are crimp fitting for the pin.

The cable, 75 ohm co-axial.

If you already have a fitted aerial with a box on the wall, then what you need is a TV flylead, available in high street electronics shops, Poundstretcher, maybe even the 99p store. Sometimes it's a combo flylead/extension, with a plug to plug cable and a socket to socket adapter, so you use it plug to plug as a flylead, or put the socket adapter on to turn it into a plug/socket extension.

If you are fitting the aerial (wouldn't recommend DIY for roof), but in the loft, you would need a fitting kit - more convenient to hang from a beam, using an angled fitting to level.

You would need a length of cable, terminating in a box, and a flylead - and Maplin or ebay, would be good places to look.

Do you mean the wire which drops from the aerial on the roof down to the television? If you do then it's just called a "75 ohm co-axial cable", or simply an "aerial cable". You can buy them from hardware DIY warehouse places like B&Q or most specialist television shops or Maplin electronics (www.maplin.co.uk).

Make sure that you buy a long enough cable and remember to get the "belling lee" aerial plug to go on the end or you won't be able to attach it to the telly.

B&Q sell a kit for £19.98

http://www.diy.com/nav/fix/electrical/tv-satellite...

Be very careful if you go on the roof to attach the top end of the cable. If you fall off then paying £130 to a professional fitter would suddenly seem to be cheap.

Make sure the aerial is properly aligned and pointing to the transmitter (check its direction with the neighbours). Any slight misalignment or damage will wreck its abilty to receive the digital tv broadcasts.

Fairly common, the lead has been flapping round for your roof or gutter and the percentsheath has been reduce by means of, whenever it rains water will penetrate and run down inside. This may increasingly corrode the braid, reason a negative signal, wet your carpet and might harm your tv and also you if it will get within. Get it replaced ASAP and fixed in position.