Patent ID: 7570224

Claim:
An antenna system comprising an antenna apparatus and a receiver connected to each other, wherein the antenna apparatus includes: a first antenna having a fixed directivity for receiving a signal in a first frequency band of television broadcast signals; a second antenna to which the first antenna is detachably attached, the second antenna being capable of switching a directivity thereof at a time of receiving a signal in a second frequency band of the television broadcast signals; an acquisition section to acquire channel information from the receiver; a judgment section to judge whether a television broadcast signal corresponding to a channel number included in the channel information acquired by the acquisition section is the signal in the first frequency band or the signal in the second frequency band; a selection section to select the first antenna as an antenna to receive the television broadcast signal, when the television broadcast signal corresponding to the channel number included in the channel information acquired by the acquisition section is judged to be the signal in the first frequency band by the judgment section, and to select the second antenna as the antenna to receive the television broadcast signal, when the television broadcast signal corresponding to the channel number included in the channel information acquired by the acquisition section is judged to be the signal in the second frequency band by the judgment section; and a switch section to switch the directivity of the second antenna based on direction information included in the channel information acquired by the acquisition section when the selection section selects the second antenna, and wherein the receiver includes a transmission section to transmit the channel information to the antenna apparatus.