Carrier aggregation not getting all bands RM520N-GL

Some people are fine with 500Mbps and they are happy if they can get such speed with a cheap pcie module. Not sure how much you can get, but I think enough to buy something decent.

If I only think it has the hardware for 5X CA…

I suppose the ones that comes bundled with the adapter. I’m not sure they are enough for my tower. Although is visible, is still at nearly 2 km. Do you have something to recommend? Something cheaper than expensive brands like Poynting, Kaser etc. I often hear the term “signal booster”, but I’m not sure how is different from regular antennas.

This one?
It has pcie 4 and gen2 usb which to me seems useless (even pcie 3 and gen1 are much more than a tower can provide in the best of conditions).
Not sure if there is a suitable adapter. I can’t find anything about the supported combos. What differences I can expect in a tower like mine? It’s a bit more than a RM520N-EU, so it may be worth to be taken in consideration, but I can’t find any source talking about it.