A method for determining an antenna beam angle for base stations of a radiotelecommunication system, notably of the cellular mobile radiotelephony system type. At the service provider, an encrypted voice transmission from a digital telephone is decrypted. The chain is suitable for wrapping around the post. The methods and neurostimulation systems steer current between the electrodes to modify a medial-lateral electrical field created adjacent spinal cord tissue. First ports of the adapters are accessible at the first region of the housing interior and second ports are accessible at the second region of the housing interior.