SSID seen on client but no Signal

I am using Mikrotik metal 2shpn .. all connections are working very well but 1 connection which is 600 meters range not so far ..ono client ssid shows but no signal .. there are gsm towers between … ( did gsm towers create problem to wifi signals ?) .. here i am uploading the picture from where i took the pic is my wifi tower and the towers seen in this pic are gsm towers client is on the other side of the towers i am using external wifi antenna for client … but problem remains..
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can you tell more about you based station setup and customer end equipment…

server side equipment . metal 2shpn with 15dbi alfa antenna … and on client side tp link -wn7200nd with 60 feet external pannel 15 dbi wifi antenna ..

you mean the antenna to the tplink wireless card cable length is 60 feet???
what cable was it???