If the staples are installed too tightly, meaning denting the cable, the
sum of all those dents really messes with the cable impedance. I see the
same problems with data cable where the stuff is mashed by the staples
or there are sharp 90 degree bends in the cable. Did you notice any
sharp bends in your coaxial cable or perhaps a staple piercing the
insulation? It only takes one staple sticking in the cable to ruin it.
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