This type of eye fatigue or eye strain is sometimes known as computer vision syndrome. It affects about 50%-90% of computer workers. Some estimates say computer-related eye symptoms may be responsible for up to 10 million primary care eye examinations each year.
MAST MOUNTED PREAMPLIFIERS. Chapter Eight-TV ANTENNA-MOUNTED AMPLIFIERS. A mast or TV antenna-mounted amplifier (preamp) is used primarily to eliminate snow on the TV screen.Snow is actually electrical noise that is generated by the TV receiver and other electrical devices.he preamp itself is mounted on the TV antenna boom or on the mast as close to the TV antenna as possible. The power supply unit is mounted indoors. Power is supplied to the preamp unit through the transmission line.
Generally, amplified antennas have better reception, but you may be fine with a nonamplified, aka passive, model depending on your location. If stations broadcast within a 20-mile radius of your home, you can probably make do with a passive antenna. If not, an amplified model may help. These antennas usually promise reception within a 50-mile radius.Check the site AntennaWeb.org to see the position of broadcasters in your area. And try to buy from companies with generous return policies in case you need to try different options (like amplified vs. nonamplified).