I am not criticizing the above-titled antenna. Mine has always provided good service. My Nagoya NA-772 is a good performer as well.
I'm just being lazy. I could do this task myself. But, before I reinvent the wheel, has anyone performed a VNA test of the Diamond SRH77CA antenna? If not, I will perform the test and compare it to a generic rubber duckie. I suspect some of the generic antennas are little more than rubber dummy loads.
Regards