I received 3 intel edison, one of them camewith the embedded antenna, but the other 2 not, there is any way of buying that embedded antenna?
There is no way to buy the embedded antenna. Actually, all of the Edison modules should have come with the embedded antenna. My recommendation for you is to contact the place of purchase and ask for a return or replacement as you just received the modules.
Do the 3 modules have the same model number?