Siretta embedded antennas siretta echo1701mipexss15 sirettas echo 17 is a wifi wlan dedicated pcb antenna that achieves impressive levels of performance due to fine tuning between 24 and 25ghz being tuned to this frequency band means the echo 11 antenna can be used with wifi bluetooth zigbee and ism based applications with a tiny footprint size of only 45 x 10mm the echo 17 is perfect for those applications where internal space for components is limited or where using an exte