Yes, they can monitor and decipher.
Chances are, the building you're in has a metal roof. This will block almost all radio transmissions.
A portable radio is able to pick up typical AM and FM signals given by over the air radio broadcast stations. An example of this type of radio is the boombox. The amount or number of signals/channels the radio receives is dependent on location and the type of radio.
An 800 MHz radio primarily operates in the 800 MHz frequency range, typically used for public safety and commercial communications. It does not natively pick up VHF (Very High Frequency, 30-300 MHz) or UHF (Ultra High Frequency, 300 MHz-3 GHz) transmissions unless it is specifically designed or equipped with the capability to receive those frequencies. Therefore, while a standard 800 MHz radio won't pick up VHF and UHF signals, some multi-band radios can cover those ranges.
No, humans cannot pick up radio signals naturally.
The optional transmissions were the Powerglide, the Turbo-Hydramatic 350 and 400.
No, not under normal circumstances do RF devices cause headaches. Radio frequencies are all around you at any given moment in time. Standard devices that you use everyday such as a radio (car, home, or walkman) or cordless phone pick up and use these radio transmissions.
SETI (Search For Extra Terrestrial intelligence) broadcasts radio frequencies that are clear they are from intelligent life forms. So if a civilization were to pick it up they know its not random.
antenna
Yes, amplifiers can pick up radio signals if they are designed to do so and are connected to an antenna.
You Can't, You Fool
No, radio antennas only pick up electromagnetic waves. Ultrasound is mechanical pressure waves, you need a microphone to pick them up.
You make your sim look at the micrspcope until the aliens pick up he/she and later the sim will become pregnant.