Siretta embedded antennas siretta echo201muflss1 the siretta echo 2 is a t bar dipole pcb antenna tuned to quad band gsm gprs 3g and wifi frequencies it measures only 75 x 25 x 17mm and has a peak gain of 2dbithe echo2 antenna is perfect for applications that require a sensitive and compact embedded antenna it is ground plane independent and compact making it a popular choice where a small size combined with efficient performance is critical many small pcb antennas are a half d