About 50 armed naxalites reached the site of the tower situated on Aurangabad-Medininagar route in the district, stuffed explosives before blowing it up, Deputy Superintendent of Police Brajmohan Paswan, said in Medininagar.
The blast left a big crater on the spot, about 200 km from Ranchi, he added.
The CPI (Maoist) is observing a two-day shut down in Jharkhand, Orissa, West Bengal, Bihar and Chhattisgarh against the arrest of two of its senior members.
Maoists blow up tracks in Latehar
Meanwhile, the Maoists on Monday also blew up a stretch of railway track in Latehar as they began their 48-hour bandh in five states, including Jharkhand.
About 20 left-wing ultras blasted the tracks between Kumundi and Hehegarha railway stations, about 150 km from Ranchi, according to Latehar Railway station master P N Tiwari.
The blast occurred on the down line disrupting the Barwadih-Barkakana route, he said.