Question: 1. To exchange information, two antennas must be tuned to the same .
2. Which kind of antenna is used in a point-to-point link?
3. When a wireless signal encounters a large obstacle, what happens to the signal?
4. Signals traveling through areas in which many wireless communications systems are in use will exhibit a lower because of the high proportion of noise.
5. Which frequency band offers 24 unlicensed communications channels in the United States?