T9A07 What is a good reason not to use a “rubber duck” antenna inside your car?
A. Signals can be significantly weaker than when it is outside of the vehicle
B. It might cause your radio to overheat
C. The SWR might decrease, decreasing the signal strength
D. All of these choices are correct
- A. Signals can be significantly weaker than when you are outside of the vehicle
- The vehicle’s metal roof and doors act like shields, trapping the radio waves inside. Some of the signal gets out through the windows (unless they’re tinted by a thin metal coating), but it’s much weaker than if radiated by an external antenna. [Ham Radio License Manual, page 4-13]