$2.)$ A simple link is setup. At one end the transmitter is transmitting on $350$ MHz at $100$ watt with an antenna gain of $3$ dBi with an antenna elevation of $5$ M $.$ On the other end is a receiver and antenna also at $5$ M with the same antenna and a noise floor for demodulation of $-50$ dB $.$ How far apart can the pair be and the signal still be demodulated change the transmission signal to $3\mathrm{.}50$ MHz what does this change. Consider both frequencies $-$ Line of sight and Skywave.