followed by "What should I buy without spending the earth i.e. medium price"
That's quite distinct from the usual "Where/what is the cheapest?..."
Cat5 or coax - both solutions work. IMO coax is the simpler and more reliable solution. There's no need to worry about the cable being UV stable, or having to fit lightning protectors, or moisture ingress, or the quality of the baluns....these are all things that could trip up the DIY installer who just wants something quick to install and that's going to keep on working.
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