ELi5: why mobile phone antena is cocncealed and represented as lines in motherboard board while mobile tower antena installed at hight?
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Because cell phone transmission are from phone to cell station and not from phone to phone. Since all phones need to talk to the cell station (and cell is more or less line of sight), it is imperative that the cell stations be accessible to the largest number of customers as possible, so they are placed high up on towers. It really doesn’t matter if you have a line of sight to other cell phones or not because any communication done to them is through the cell station.
Antennas typically operate best (most efficiently) with a size equal to about half their wavelength. The wavelength of cell phones is somewhere around 6 to 12 inches depending upon the particular frequency. This is too large for your cell phone, so they trade efficiency for size. For the cell station, they have plenty of room, so will go with the most efficient size.
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