I Need To Run CVI About 2,500 Feet. What Should I Do?

I've not found a good answer so I thought I'd ask here:

I need to run HDCVI video over Cat3 approx 2500' (no other options). What should I use?

I'm currently using regular passive baluns - the picture is great, but black & white. Can you make a recommendation or referral? Thank you.

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