Hello. I like to have laptops that can gain wifi access in fairly long range. I have an older 21 dbi omni antenna attached to an rtl8187 adapter as well as a macbook with airport. I would have the 21 dbi antenna find a few more connections but they would never hold a good connection like the mac's airport. Basically, I wonder if I should upgrade my antenna/adapter to something better and more modern? (if so, what?) OR are there network cards out there already attached, like airport, that perform better?