I dont know too much about it, so i need a hint of some of the wireless guys..
My Adapter, alfa 500 mw is damaged.. its tx power is incredibly low now, kind of just 1 meter range conectivity..
i think it could be because i tried to use it once, without an antenna

yeah, now you could be wondering why.. just curiosity..

Could that be the reason it is damaged? what happen if i use my alfa 500 mw without an antenna attached to it?

Another clue, i had used it with a 16 dbi omni-directional antenna.. and my adapter was getting hot. I am not sure what have damaged the adapter.

I want to know, because i will buy another one, and dont want to commit the same error again.