ath and D-Link G520 supported features

[SAMU]

Hi ALL.

       I want to buy D-Link G520 WiFi adapter.
       In adapter description is written that it support only 11Mb/s in
       ad-hoc mode. Can i get more speed with ath driver or it hardware
       specific ?
  

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Best regards,
 SAMU                          mailto:samspeedu at mail.ru