Because an antenna is flexible, you will get it caught in door jams and such. Murphy's Law.The Diamond RH77CA series are excellent antennas.
Diamond also makes the RHF40 antenna. It has the same specs as the RH77 series, and is about an inch taller.
The big advantage of the RHF40, IMHO is that it is *extremely* flexible. With this antenna you won't run into any of the issues that N1BHH mentioned.
Just my 2 cents.
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