To provide a receiving apparatus capable of dealing with various uses with
a simple configuration. The receiving apparatus includes an antenna unit
and a receiving apparatus main body. The antenna unit includes a
receiving antenna that receives a radio signal including image data
transmitted by a capsule endoscope inserted in a subject, and the
receiving apparatus main body is detachably attached to the antenna unit.
The antenna unit functions such that it demodulates the radio signal
received via the receiving antenna into a baseband signal. The receiving
apparatus main body acquires the image data based on at least the
baseband signal.