In unguided medium ree space the electromagnetic E signal wave spreads as it leaves the ransmit antenna. Since the po e EM signal resides at the surface area of the wave front, signal power is described as signal power density (i.e., watts per area). As the signal propagates away from the transmitter, power density decreases and attenuation is experienced. True False QUESTION 20 10 points Save Answer An ideal isotropic antenna is a theoretical antenna that propagates signal energy from a single point antenna. True False QUESTION 21 10 points Save Answer Select the correct statement regarding modulation/demodulation a. the passband signal is combined with the carrier wave to produce a baseband which operates at a higher frequency b. the carrier signal is combined with the passband wave to produce a baseband which operates at a higher frequency c. the passband signal is combined with the baseband wave to produce a carrier which operates at a higher frequency d. the baseband signal is combined with the carrier wave to produce a passband which operates at a higher frequency