Can atheros 5.8ghz work over distance of 1.5 mile?
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Pigtails, connectors and such are not necessarily working on 5.X even if they work great on 2.4.
A lot of connectors have different specs. Be sure to get wires/connectors/pigtails that are made for operation up to 6ghz, or you might find yourself in all sorts of weird trouble. And if you keep testing with 2.4 antennas on the same cables you might find yourself even more lost ???, since everything seems to perform nicely on 2.4 :-\