I like using straight edge blades for wire/coaxial work. It helps keep the cut around the sheath and the outer conductor clean and even. It also seems to work better at ripping material, like carpet or belting, as the material being cut doesn't slip as easily off the tip of the blade.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)