I bought a ALFA AWUS036NHA wifi adapter. But I couldn't find the Genuine ALFA 9dBi antenna. I'm out of USA and I only use eBay. So in eBay But other sellers have non-brand 9dBi antennas. But I want to make sure 'should I buy Genuine ALFA antenna' or is it fully compatible other brands or non-brand antenna for my device without any performance drop. Is 9dBi antenna the maximum one, can upgrade to this device to improve its performance. As seller's description it's a 2000mW wifi adapter.
But anyway very important thing what I want to know if I'm gonna upgrade my wifi antenna, should I want to buy a genuine that wifi device manufacture's own wifi antenna or can I upgrade with a non-brand wifi antenna? If I can with non-brand one is it gets me any performance issue???