Siretta direct mount antennas siretta delta1cxsmamss23 the siretta delta 1c is a direct connect stubby antenna tuned to the quad band gsm gprs frequencies at only 48mm in length the delta 1c is sirettas smallest stubby gsm antenna despite its small size it performs at a high level and outperforms most stubby antennas in the market today achieving a peak gain of 215 dbi the delta 1c offers a small and compact cable free antenna solution that is ideal for use with wireless term