system
Given the following post, respond as if you're commenting on Reddit:
human
Why do older models of cars have long antennas, while newer models have short ones or none at all?
gpt
The old long antennas were simple quarter wavelength monopole antennas. The science behind them is very simple, for the most part how they work could be done with pen and paper.

Newer devices use much more complicated antennas that require lots of modeling and simulation to design, something not possible years ago. Most of the things with "no antenna" usually actually have an antenna drawn onto the PCB or otherwise integrated into the device, on the iPhone 4 for example, the trim on the case is the Antenna.

And finally, with modern electronics there is simply less thermal noise and they are more sensitive. With this in mind, they can generally get away with a less effective antenna to arrive at the same total SNR for the device.