radar
Listen to the voices in your head. They will show you the way.
I would first suggest getting an HDTV antenna, because it will allow you to get better quality shows than a standard TV antenna. ClearStream antennas have some highly recommended HDTV antennas.
Amplified antennas or antennas with amplifiers are usually the best choices for DTVs. The digital antennas RCA ANT751 and RCA ANT800 receive good reviews . The Channel Master digital antenna CM-3020 is also highly rated as good antenna.
I highly doubt it. It's too early to detect.
Radionics is a highly controversial field that claims to detect and modulate life force using electronic devices.
Fluorine gas is highly toxic. You can use a canary and see if it dies.
At the minimum, a radar is a device that can detect the range of the target object (ie. radar gun used by law enforcement). A more advanced radar can locate the range and direction of the target object (via the azimuth). For example, the old spinning radar antenna seen on TV can locate an object based on the detected range and the direction the antenna is facing at the time. These can still be used to track the weather as clouds can be tracked. The most highly advanced radar can identify just about everything about the target object as if it is in front of you. An example of use is tracking space junk.
I highly suggest the following: www.crutchfield.com/ISEO-rgbtcspd/learn/.../car/antennas.html and www.radioshack.com/product/index.jsp?productId=2062261.
instrument that respond to ground motions such as caused by earthquakes, volcanic eruptions and explosions
Amplified antennas or antennas with amplifiers are usually the best choices for DTVs. The digital antennas RCA ANT751 and RCA ANT800 receive good reviews . The Channel Master digital antenna CM-3020 is also highly rated as good antenna.
In general, an antenna is "cut" or "built" for one frequency, or for a band of frequencies centering on one particular frequency. This antenna will respond to all frequencies, but will only exhibit "maximum" gain at one frequency. Frequencies higher or lower will not be received quite as well, and the farther from the "tuned" or "center" frequency the signal is, the less gain the antenna will provide on that frequency. As we work with an omnidirectional antenna, we can "tinker" with it a bit in an attempt to get it to work with a broader range of frequencies, but as we broaden the usable spectrum over which it will work, we will see less gain on the "center" frequency. If you're getting the idea that tuning an antenna involves trade-offs, you're getting the right picture. No improvements are possible without "cost" in another part of the operating spectrum. If we move to a directional TV antenna like, say, one of those antennas (not the dish) that still can be seen on some rooftops, we see what is basically a modified log periodic antenna. This antenna will generally be "pointed" or "aimed" in the general direction of the transmission antenna of the station(s) for which reception is desired. Stations with broadcast antennas to the side or the rear of this antenna won't be "seen" as the antenna is highly directional. Having said all that to get you up to speed on some fundamental concepts of the antenna, as we move up the frequency spectrum (starting "low"), the gain of the antenna will increase until we reach the "center" or the "tuned" frequency for that antenna. After that, increasing the frequency will result in signals with increasingly lower gain.
Photoreceptors that detect light and dark, as well as shades of gray, are called rods. Rods are highly sensitive to light and allow for vision in low-light conditions, but they do not detect color. They are one of the two main types of photoreceptors in the retina, the other being cones, which are responsible for color vision.