Field Guide to Math in Humboldt
No. 10 Parabolas and Parabolic Receivers
Parabolas and parabolic reflectors. A parabola reflects all the energy coming in to the dish to a central or "focal point". Conversely, energy emitted from the focal point is sent straight out in a beam like a flashlight (which has a parabolic mirror behind the bulb) These parabolic antennaes are located at KIEM TV at the bottom of Humboldt Hill. The illustration is from Wikimedia Commons by Cmglee.