Siretta direct mount antennas siretta delta7bxsmamss11 the delta 7b is a quad band gsm gprs frac14 wave omni directional antenna with a peak gain of 2dbi its hinged joint provides easy positioning through 0 45 amp 90 degrees tuned to quad band gsm gprs the delta 7b can be used for worldwide gsm applications common m2m applications for this antenna include car park utilities metering wireless key entry security systems remote monitoring and many other gsm gprs based