Who was the first person to build an astronomy radio telescope?

Karl Janksy, a Belll Labs engineer, develloped a sort of rotating antenna device- resembling a movable bridge-not a radar dish, some time in the thirties, the idea of possubly tuining in on intelligent lilfe from out there fueled the popular radio magazines- such as short wave craft, Mr. Gernsback had some wild ideas- but was correct that Radio contact was far more likely-0 cheaper ( but no $l2.50 ham receiver in depression dollars) , and probably safer than the experiments of Goddard ( rocket scientist who also had patents on the Tunnel that bears his name and is l00 years old this year! Open for l00 years , started in l905. completed in l9l0.