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Originally Posted by rdhw
It is usually coax cable, 75 ohm impedance, of a very high grade, similar to that used for satellite downlinks, usually dual-screen. F-type connectors are crimped on to the cable.
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And you can buy all the kit you need at Maplins
In fact you should be able to buy Satellite-grade coax ready made up just about anywhere (even Dixons). Just make sure it has f-connectors on it.
The reason you're not meant to change the length of the cable, by the way, is that it affects the signal level to your modem, which can balls up your service if it drifts outside normal operating range and you can balls up the service for your neighbours if you use shoddy cable and introduce interference.
If you do it properly, don't alter the length of the cable by too much, and use proper quality equipment, you should be fine.