I have been wondering about this for long time.I see the AM transmitter antennas are quite tall. This is due to the fact that the wavelength of the AM carrier wave is not as short as a cellular communication's carrier wave. At 1MHz the wavelength is 300m.
I also know that the AM radio receivers I encounter do not have that long antennas. In a question in this site I remember one was writing that the receiving antenna size do not need to be half of the wave length to detect the radio signals. It could be much smaller. How much smaller I dont know.. A mystery.
So in antenna theory some texts relate the wavelength to antenna size. But when it comes to practice I see that wave length antenna size relation is followed by transmitter size but not at the receiver side.
I mean transmitter antenna size is more or less similar to carrier wavelength. But receiver antennas can be much much smaller..
If we can receive the AM radio signals by a realtively much smaller antennas, why then the AM transmitters also not short but very tall? Is it possible to radiate AM modulated signals by a lets say 1m size antenna for a radio broadcast?