I don't think the connector is compatible with the ICOM IC-R15.The best airband antenna right now is the Radtel Aviation Antenna from Amazon. It is a thick, tall antenna but it's very broadband and covers 118-136 almost entirely under 2:1 SWR.
For the price, it's a great value: https://a.co/d/dePHuY8
Update: you can get (2) for $10