Ixos 105 is one of the best digital coax I have tried.
Prices vary a lot, but can be cheap --- https://www.ebay.co.uk/sch/i.html?LH...105&_sacat=293
I can loan you one if you fancy, Roy - just PM me your full name and address.
I've also got 0.5m pair of good W&M (Dutch) balanced cables you could try if they are long enough.