Lawyer Tawengwa Hara said Wednesday they were detained at a roadblock near the southern town of Gwanda, and he located them on Tuesday in police cells in the western city of Bulawayo.
The three have told police they had been asked to collect the equipment from Bulawayo and return it to South Africa.
Hara declined to name them, but said they were being charged under telecommunications legislation for "being in possession of equipment believed to be used for broadcasting without a licence."
