The Diamond RH77CA antenna is a good all around "rubber ducky" BNC antenna for the various frequencies it covers. I have several. While it is sold as a transmit antenna for amateur radio handhelds, it works well enough as a RX antenna considering its size. When I purchase a new antenna, I test it against the RH77CA. Dozens of handheld antennas later, that testing is pretty much over. I still carry the RH77CA, but the Diamond SRH320A antenna gets a mention, although it has an SMA connector.
While one should use an antenna tuned for the frequencies they want to cover, many often monitor a wide range and the Diamond RH77CA provides for that well enough. Here's the important part, I continually find the supplied antennas with scanners to be poor performers. For you, it worked beyond expectations and that is a good thing. Thus, why purchase something else? If you do, the RH77CA has an acceptable price point.
Your question has been asked countless times before. Search and you will find a plethora of responses. Enjoy the journey and what it teaches you.
Two things I have learned:
- Some of the Diamond antennas are the better of the bunch.
- Some of the Diamond antennas are also the worst I have ever purchased.