Motorola two-way radio antenna
Look in the yellow pages and find a Motorola two way radio dealer, others are fine, but they may not be able to convert this number that I hope I remember...
TAD-6113A, I think.
It is a kit 150 to 172 mhz with coax, mount and antenna.
The antenna is a stainless steel whip, cut the ball off the end and you are ready to go.
It unscrews easy and the mount is still sealed.
Replacement whips are a couple bucks.
FM is 88 to 108 but the antenna works fine, I used them in the past.
They can order the one for a lower portion of the spectrum that is closer and would work better.
The gotcha is the broadcast radio is 75 ohms and the two-way is 50 ohms but it does not matter much.
If you already ran you coax they can sell you the mount.
They go into a 3/4 inch hole and have o-ring seal, I have installed hundreds and they will work perfect for your application.