Batboard

Hey guys , new to the board here , & might I add this is a GREAT site that I wish I would have found it a bit sooner for other installs....!! lol
I have a bit of a petty antenna question actually .. I was inquiring upon where I could find the 4 LoJack antennas that are mounted on Police cruisers .... I have an Ex Highway Patrol cruiser that I am re-furbing for small car shows that I would like to keep true to form & such, but have not had any luck finding them .. If I am not mistaken , Antennex makes them but does not sell on their website ...

Any part numbers or info would be greatly appreciated..

Well, since LoJack operates on 173.075, the dopplar antennas should be VHF high antennas. I've never got a super close look at them, but I know they're spring loaded at the base of the antenna. What kind of mount is in the car right now? NMO, LM, etc.

Right now the holes mount a 3/4" NMO ... The only thing I can put together , is that they are the Antenex L8 stud mount with the shock spring & I believe 17 inch whip ... But I am not very sure ..

LoJack antennas can be any VHF antenna cut for 173 MHz.

Some agencies use 3/4" NMO mounts with generic whips, while others use Larsen 3/8" stud mounts with springs. If you have 3/4" holes, get 4 NMO mounts and some generic VHF whips.

What would be the correct length for 173 mhz ..? About 17 - 18" ?

About 16.25 inches. Or 16.231213 according to the formula.

THanks for the great info guys ... I found some Larsons that are almost identical to what I'm looking for ,, but they come with a 3/4 "LM" mount .. Or what looks to be a 5/16 stud mount .. I'm not familiar with this mount , is it similar to mounting & sealing like an NMO?