What types of antennas are typically part of an ADF system?

An ADF (Automatic Direction Finder) system typically incorporates a directional antenna and a sense antenna to effectively determine the direction of incoming radio signals. The directional antenna is primarily used to receive signals from a specific direction, allowing the system to evaluate the bearing to the source of the transmission.

The sense antenna complements the directional antenna by helping to improve the accuracy of the bearing information. It assists in resolving ambiguity caused by signals that may be received from different directions, enhancing the overall effectiveness of the ADF in navigation.

Understanding the function of these components is crucial, as they directly influence the ADF's ability to provide precise navigational information to pilots. Other types of antennas mentioned in the other choices, while important in aviation, do not fulfill the specific roles required in an ADF system. For instance, loop antennas are often referenced in relation to ADF systems, but the term "loop antenna" commonly overlaps with the directional antenna and does not include the necessary sense antenna component which is vital for performance.