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Actually, not sure I fully understand. That product seems to be an access point, which are usually used, err, 'upstream' of the bit before the internetz fly through the air. Is there something special about this one that means it could be used basically as a big WiFi adapter? Or is it just a case of sticking a usb Ethernet adapter between the WAP and the computer, and would that work with pretty much any access point?
Another edit: I know some unifi APs can do wireless uplink, and the uplink APs are unifi, but I don't have access to configure them, so the 'downlink' AP will have to just act as a dumb wi-fi adapter.
Polygon-
If I have understood the MicroTik product correctly you can either use them as a pair or use one as a CPE, in which case you can connect to another AP. The PDF is a little clearer https://i.mt.lv/cdn/product_files/LHG_5_all_180105.pdf
If I've understood it correctly the only other thing you need is a PoE switch to power it and connect your PC. If you have a wireless client at your end you would need a second AP of some sort.
jellybaby
There is no such thing as an SMA to USB adapter. There are WiFi radios with SMA connectors, some of which have a USB interface. To be legal the whole radio and aerial combination has to be within certain limits which generally means you can't mix and match but have to buy vendor A radio with vendor A aerial.
At high frequencies the signal loss in the cable and connector is high so trying to terminate the cable without proper equipment is likely to be a problem.
The better solution for this kind of thing is to get an external radio and aerial and then run something like Ethernet back inside. Maybe something like https://www.senetic.co.uk/product-rblhg-5hpnd/ (I haven't used that one).