As seen on others questions biological radio could be a thing.
I was interested in developing a species with such abilities.
The primary use for radio wave would be communication within the species. Mostly small messages such as warning others of danger or saying "This my territory, get out."
This species could develop these two other abilities with enough practice:
A radar like function.
The use of of special radio waves in a more offensive manner designed to harm other species (maybe it could mess up the hearing of other species or alter its brain pattern).
So the primary question is: Where should this organ/muscle/limb be place in the anatomy of my species?
I don't know if the transmitter and receptor should be the same organ or two separate things. Also I'm wondering if I need more than one transmitter/receptor.
What I have imagined so far for the anatomy of my species is a sort of bulky human. If that's not the best form to use for development of such an ability, feel free to come up with a better design for your answer.
Also the range of his ability should be approximately 100 meters.