buy some of this:
http://www.maplin.co.uk/module.aspx?...No=275&doy=3m5 & these:
http://www.maplin.co.uk/module.aspx?...=10447&doy=3m5 & look here for how to correctly fit it:
http://www.uk-satellite-tv.co.uk/tec...lp_154117.html
Fitting the F connectors
The connectors are easily fitted and require no special tools. Prepare the ends of the cable by removing about an inch of the outer sheath. Tear off the copper screen, twist the braid together and pull it back so it is pointing away from the prepared end of the cable. Remove all but about an eighth of an inch of the inner insulation. Screw the knurled end of the connector over the outer sheath of the cable and over the braid wire. Keep screwing the connector until the inner insulation is located as far as it will go against the inside of the connector. Make absolutely sure that the inner solid copper conductor is not in contact with the braid screen or with any part of the connector. Cut the inner copper wire so that only an eighth of an inch protrudes beyond the end of the connector.
(btw although its on about satellite tv the principle is the same for fitting f plugs)