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Why does the reception of transistor become clear when the antenna is touched?

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Why does the reception of transistor become clear when the antenna is touched? Radio frequency region of electromagnetic spectrum spreads from few kilohertz [KHz] to few thousand megahertz [MHz]. The geometry of human body allows the limbs, head and torso to act as three dimensional antenna factor. It amplifies the signal as high as five times the signal one may receive with other type of antennae like monopole, dipole and the like. We can see this effect in any radio frequency receiving instrument, such as, oscilloscope in any electronic lab or more commonly a transistor radio. If one grabs the tip of the antenna or touches the body of any transistor, the signal received multiples several-fold and the reception improves. circuit diagram of a high performance bias circuit of a radio