You don't add more mW of power to a card or USB just because you put an antenna on it! All your doing by adding an antenna is increasing the dBi rating of the card that affects the Tx and Rx power. More power can only be achieved by adding a signal booster or AMP inline at the antenna and card. And the alfa awus036h already has an amp in it. Thats why its better to buy the awus036H over the awus036s.