3-20
A-4. Omnidirectional.
A-5. Antenna directivity.
A-6. Reciprocity.
A-7. Parabolic.
A-8. Light waves.
A-9. One.
A-10. Determine elevation.
A-11. Vertical.
A-12. Forces the radial segments of a wavefront into parallel paths.
A-13. Some wavefronts are accelerated so that all wavefronts exit the lens at the same time.
A-14. Delay lens.
A-15. Antenna Array.
A-16. Driven Array.
A-17. Frequency or phase of radiated energy.
A-18. Horizontal.
