Here's a new compilation about another Hillman character, an even weirder one this time, Micro-Face!
https://comicbookplus.com/?dlid=85071
The trope of a character that can use radio equipment to "project" his voice was something oddly recurring in the Golden Age. The most notable example is DC Comics' Air Wave.
This character is very similar to a double-appearance Centaur character called "The Voice", who first appeared in Amazing Man Comics #22 in 1941, you can check it out here: https://comicbookplus.com/?dlid=14735
And his second (and last) appearance was in Stars and Stripes Comics #2: https://comicbookplus.com/?dlid=20222
Despite the similarities, 1943's Micro-Face seems to have had a slightly greater success.