Antenna extension cables

I’m re-configuring my network setup. Modem, router and some extra stuff (RPi’s) I want to put inside a server cabinet. But for good wifi coverage I need to extend the antenna’s with 3 meter each.
May I use the cables shown in the link?
Type: RG-174U

Those cables I mentioned didn’t work. Already about 50% signal loss over 3 meters open air.

So I looked again for cables and ended up with these:
Almost no signal loss. They’re only a meter shorter, so I have to improvise a bit with placing the antenna’s. But everything is already running from within the sever cabinet in the basement.