What type of antenna is this ?

I have seen several of these antennas in our city and was wondering whether anyone can identify what this is, as per the attached pic ? Could it be some sort of direction calculator, similar to VOR ? What is the antenna used for ?

it looks a bit like a direction finding aerial the coastguards use for small boats that have VHF ship to shore sets.
Frank

Thanks for the insight. Using search term "direction finding antennas" does indeed show several suppliers of these antennas. I am guessing that in our area they are used by vehicle tracking companies.

In the UK , the vehicle tracking system ("Tracker") use only 5 vertical dipoles (one central). I guess they swing the phases electronically to peak the signal in any one direction. From memory the CG use a much older system and use 13 dipoles.
Frank