What conclusion can you draw from paragraph 6? Ham operators like to set set up up their equipment in parking lots.
Many car owners forget to change the batteries in their remote locking devices.
Radio signals can not penetrate glass doors.
Malfunctioning equipment can emit stray radio waves.

Occasionally ham operators are asked to solve down-to-earth mysteries. Remote locking devices for cars use radio waves. Outside one department store, shoppers discovered that their remote locking devices did not work. Ham operators were brought in. They walked around with hand-held antennas and a receiver. They discovered that strong stray radio signals emitted from the building interfered with the locking devices. Store personnel were alerted and repaired the offending equipment. By law, no one can transmit radio signals strong enough to interfere with other equipment nearby. Ham radio operators have fun in many ways!