Silver and ptfe = bad idea due to tribolectric effect of silver with ptfe. I don't know where this recipe has come from as a great idea but it isn't. (This coming from someone who designs them btw and has many years signal processing experience).
Good cables = no nonsense shielded high quality copper coax in something like a foamed polyethylene dielectric.
Good cables = no nonsense shielded high quality copper coax in something like a foamed polyethylene dielectric.