High Gains: Dish Antennas such as dish antenna 2.4G are capable of very high gains. The larger the "dish" in terms of wavelength, the higher the gains.
High Directivity: Like gains, Dish Antennas can also provide a high level of directivity. The higher the gains, the narrower the beamwidths. This is a significant advantage for applications that only need to transfer power over a small area.
The function of the Dish Antennas is to reflect a relatively large area of electromagnetic waves to a relatively small area, thereby increasing the power of the electromagnetic wave on this small area, so that the power is strong enough that the high frequency head can detect it.