Anchor Barracuda

Originally used Belden RG58A/U Coaxial Cable
20 AWG stranded (19x33) .035" tinned copper conductor, polyethylene insulation, tinned copper braid shield (95% coverage), non-contaminating PVC jacket. Overall Nominal Diameter: 0.195 in. , M17/155-00001
 But found it too stiff.

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 Then started using Marine Coax sold by West Marine, Anchor Brand.
 Really flexible

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The coax I use now is the same but, has a polyurethane jacket similar to what Eric Foster used.
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Hi Sven,

 The orange cable is a specially made RG58 coax. It is made for the offshore industry, specially for underwater use, with a polyurethane outer jacket rather than pvc. This is much stronger and hard to penetrate by contact with sharp edges. Water at pressure would  very quickly siphon along ordinary coax if there was even a small cut, and enter the coil windings. Salt water would write off both the coil and the cable and even enter the electronics unless a water blocking connector was used. Of course the orange coax is considerably more expensive, but I thought it was worth it as even for shallow water work it gives added protection.

 The cable I used is by JDR Cable Systems, part no. CAF9007.

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 I haven't bought any for some years and although I can find the company on the internet, I can't find the product. Maybe it has been discontinued. The 58cu by Ancor may be as good and it maybe worth while asking for a sample length. Both inner and outer conductors must be tin plated copper - the inner conductor stranded, not solid.

 Eric