Siretta direct mount antennas siretta delta1axsmamss11 the siretta delta 1a is a direct connect stubby antenna tuned to the quad band gsm gprs and 3g frequencies despite its small size of only 56mm in length it still performs at a high level that most stubby antennas cannot compete with the delta 1a offers a small and compact cable free antenna solution that is ideal for use with wireless terminals within the m2m industrythe delta 1a is commonly used for applications such as car