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Radio is actually just an electrical effect.
A radio receivers antenna, or a person standing in air, becomes a plate in a high frequency, air capacitor. As the transmitting antennas, surface is charged. The transmitting antenna is the other plate in the air capacitor. The air being the dielectric.
Air is an insulator and a dielectric, that means it raises in voltage many times more quickly then a conductor, like copper or aluminum. So although air does not conduct much amperage, it will transmit voltage a great distance.
Many agree there is no limit to the range you can transmit a radio signal, no matter how weak it may be, when it reaches its target.
Large transmitters, and transmitters close to your person, cause the most damage to cells in the body. High frequency even at reduced voltages and Ampere's, can be very disturbing to the human body. Because the human body is neither a conductor, or an insulator. It is somewhere in between.
High frequency can cause cells to change in polarity very quickly, causing heat, and cell damage. Chronic radio exposure, is something to be avoided.
Welders, individuals, that weld as much as three hours a day, actual ARC on time, are often exposed to extreme radio wattage. With minimum physical aliments. The emissions from some types of MIG, welding can knock out radio receivers, pagers, and cellular service, to local radios, pagers and cell phones. However the frequency is lower then wireless phones and cell phones.
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