From the reading I have done, it seems like a ferrite rod antenna is mainly used to receive long and medium waves (500Khz to 1Mhz) but I don't understand how they differ from old fashion wire/monopole/dipole antennas?
This calculator shows a simple monopole antenna for 1Mhz frequency would be 468 feet which is of course too long to be practical. Is a coil antenna essentially the same length of wire rapped around a rod, maybe just to make it shorter? or it works on a totally different concept? if so then why can't that "concept" work for say 100Mhz frequencies and we need to use a whip antenna instead? also what is so special about ferrit and why can't it be a some other metal?