Final answer:
The length of an antenna needs to correspond with the resonant frequency to effectively receive desired electromagnetic signals. Adjusting antenna length can improve radio reception. This principle is relevant to radio communication but not related to the physical loading of railcars.
Step-by-step explanation:
When loading a railcar, handling the antenna isn't typically relevant to the process. However, the principles of how antennas work can be related to the electromagnetic waves involved in radio communication, which involve resonant phenomena. An antenna's length is significant because it must resonate with the desired frequency to effectively receive a signal. When tuning a radio or adjusting an antenna, you're creating the right resonant conditions to pick up the specific electromagnetic waves used for broadcasting. Adjusting the length of an extendable antenna on a car radio can result in improved reception, demonstrating this relationship between antenna size and resonance with particular frequencies.