Siretta direct mount antennas siretta delta6axsmamss11 the siretta delta 6a is a quad band gsm gprs 3g amp ism frac12 wave omni directional antenna with a peak gain of 68dbi making it sirettas highest performance whip antenna its hinged joint gives the user flexibility with general positioning through 0 45 amp 90 degrees tuned to quad band gsmgprs the delta 6a can be used for worldwide gsm applications furthermore it is tuned to cover 3g and the 868 and 915mhz ism fre