You have made a connection in the interference prone and typically VERY busy 2.4 GHz band. your Router is transmitting using 802.11n rules, which are old, bordering on antique, Issued in 2003, replaced in 2009 with 802.11ac and again in 2014 with 802.11ax).
It is very surprising you have not connected in the 5 GHz band instead, unless your Router is so old it does not have the 5 GHz band. If you are in an apartment building, that will NOT be good enough.
You have good signal strength at -59 dB, where about -40 is 'right next to the router' and -65 is 'searching for new network to join'. What is NOT good is noise at -75 db (should be more like -95 dB) which indicates active interference, likely from other Router nearby, microwave ovens, baby monitors, or portable landline telephone and similar sources.
You are using 16 pattern per signaling interval, likely because the next step up, which uses 64 patterns per signaling interval, is not sustainable with this interference level. Both antennas in your Mac are working together.
I do not think you have a hardware problem.
if you post the make&model of your Router, readers can do some research and see if it supports 5 GHz band as well.
