My little experience (not an expert on this) with outdoor cabling is that when copper cables are larger than 10m no matter of the shielding, you need a surge arrester at both ends. This is also the case for coaxial cables.
In my case, 4-6000V builtin Lightning Protection, Surge Protection and Voltage Transient Protection of ip cameras proved to be sufficient for the past 5 years in many occasions (when omnia and other equipment including cameras with coaxial cables where fried).
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