http://i.imgur.com/d6i7AHO.jpg
http://i.imgur.com/zhGQS7q.jpg
Signal is excelent through 2 concrete walls (-51 on android phone) and also higher than an standard RB951Ui-2HnD with 2-5dbi. With standard tplink 841 signal was very poor and loose conectivity very often.
This is just a testing projects, maybe someone needs this infos.