Need to buy pigtail and cable for lora 7249

hello, i need to move antenna from gateway 7249 an put it on top of pole.
like this:

i need pigtail cable 1m or 1.5m to do that… is this a problem?
do i need to buy more Dbi gain antenna to compensate the loss of the cable?

where can i buy this?

can i buy this one:

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