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?
https://www.allekabels.nl/sma-kabel/1281/1306818/rp-sma-verlengkabel.html
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:
https://www.allekabels.nl/sma-kabel/1281/1197584/rp-sma-verlengkabel-professioneel.html
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.

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Any idea if the 5 meter version would be usable?

I’m using the 5m versions now for several years to place the antenna’s higher up. But I’m not sure if it is the cables or how the antenna’s are placed, but it seems there is some signal loss. Some parts of the house I have a very weak signal.
I’m not sure to say what causes it.

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Isn’t it better to just put the router or an AP closer to the point where antennas should be? You won’t get any issue with ethernet being a few meters longer, even if you use the simple mechanical cable-joiners (I don’t know what it’s called).

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That is the whole point. I had everything placed at different places around the house. A bit of a mess. I wanted to have everything together in one place out of site. And then there are not many options to choose from.

There is an option to use some powerline adapters, but it is not what you expect probably…