I have made link tests and put these on my website.
See here the result.
NV2
http://www.wirelessinfo.be/index.php/linktesten/sxtacpages/nv2-1km-ecee-e
802.11 AC
http://www.wirelessinfo.be/index.php/linktesten/sxtacpages/802-1km-ecee-e
Hopefully this is useful