|Medium Wave (AM) Antennas|
The Select-A-Tenna 541 is your ticket to improved AM Band performance on your portable radio. This is the original Select-A-Tenna used for the past 28 years by hundreds of thousands of satisfied customers. It provides the AM radio signal strength improvement required by most users. The Model 541 produces a signal gain of +30 dB when used with most AM radio receivers which have internal ferrite rod antennas. The Model 541 is a passive device that requires no wires, no batteries, no plugs, etc. It works by simply placing it next to your radio and tuning the knob to the same station frequency as your radio.
The Select-A-Tenna functions by concentrating the radio station signal energy in the near proximity of the 541. If your radio has an internal antenna and is placed in that same near proximity, it shares the same signal concentration and gain improvement.
While the +30 dB signal gain improvement from the Select-A-Tenna is underway the radio's automatic gain control will also reduce the signal above a threshold level. The net effect is to make very weak signals +30 dB stronger and yet have no perceivable effect on already strong station signals along with everything in between exceedingly improved. Select-A-Tennas are approximately 11 inches in diameter and 2.5 inches deep.
The Select-A-Tenna 541-M (above right) is the same as the original 541, but if features a 3.5 mm "mini" jack on the front panel that allows the unit to be connected to a outside long wire and ground. This is handy for those trying to listen inside a concret building or trailer.
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