If you can get a shielded cable it is best. Shielding is actualy an outer metallic sheath.
Here is an example:
http://www.bluejeanscable.co.uk/store/6channel/index.htm
blue jeans LC-1 or Belden 1505F
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A shielded cable is an electrical cable of one or more insulated conductors enclosed by a common conductive layer. The shield may be composed of braided strands of copper (or other metal), a non-braided spiral winding of copper tape, or a layer of conducting polymer. Usually, this shield is covered with a jacket. The shield acts as a Faraday cage to reduce electrical noise from affecting the signals, and to reduce electromagnetic radiation that may interfere with other devices. The shield minimizes capacitively coupled noise from other electrical sources