Yes , adding multiple SSIDs is easy to do on DDWRT . You can just add another virtual interface onto any existing physical wifi adapter . I started out by putting my normal SSID on everything , then on the 5 Ghz adapter I clicked add virtual interface so now I have 3 places to fill in SSID , security , etc . 2 of them are on 5 Ghz and 1 is on 2 . 4 . There ' s no significant penalty . Technically , advertising more SSIDs means more beacons flying around , but it ' s not something worth worrying about at this scale . Maybe there are 1020 beacons heard from your home , and this increases it to 1121 . not a huge change . If you were going to put 50 SSIDs on each AP then maybe the overhead would be worth worrying about .