Can I Use my existing CB Antenna Mount for GMRS?

[shacdaddy]

My existing tailgate mount CB antenna works just fine w/ my new GMRS unit. Zero issues.

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[Bocephus]

My existing tailgate mount CB antenna works just fine w/ my new GMRS unit. Zero issues.

Thats cool! Have you had a chance to get a sense of range? I know nothing about radios, but am interested in moving from CB to GMRS, and have been weighing options. I'm wondering how well the CB antenna performs, in comparison to antennas made for GMRS.