Using the Okumura model for open terrain, calculate the height at which the transmitting antenna is located, if the received signal level is 2.1x10^-8 mW. The transmission power is 150 mW, the height of the receiving antenna is 2 m. The system uses a frequency of 950MHz and the signal is received at a distance of first four digits of student ID/ 2 in m from the transmitter. Gn = Go = 1 dB