@kereru I am using fairly generic LMR240 50 Ohm and RG402 75 Ohm cables I bought from a chinese seller, bydpete, on ebay. It wasn't clear to me from my reading what the best, affordable cable would be but I'm not going to spend $180 for something like the Gustard C2.
I have also ordered a couple of the Mini-Circuits BLP-10.7+ filters that the guy at EtherREGEN suggests using which are supposed to obviate the need for expensive cables etc. Swenson's white paper is here:
https://cdn.shopify.com/s/files/1/0660/6121/files/UpTone-J.Swenson_Clock_Considerations.pdf
https://cdn.shopify.com/s/files/1/0660/6121/files/UpTone-J.Swenson_Clock_Considerations.pdf