Interesting! What are the available options?
Designed to reach targets at distances over 1,000km away. The Harpy’s RF seeker with an electro-optical sensor, allowing it to acquire and pursue non emitting targets and moving targets.As a loitering weapon, Harop can also be used against suspected ballistic missile sites, where target missile silos and shelters as they are opened before firing.
Raytheon and Israel’s IMI make such weapons. Strictly speaking the Harpy/Harop is not in the same class, it’s more a suicide-UAV than a loitering missile.
The Israeli Delilah (in service) and Raytheon’s concepts are most likely to be the contestants. Not sure about the status of some US loitering systems which were cancelled.