*Question G9D09:
What is the primary use of a Beverage antenna?*  

*Correct Answer is  A: Directional receiving for MF and low HF bands*  

### AI Response: (may contain errors)  

The correct answer to the question about the primary use of a Beverage antenna is:

**A: Directional receiving for MF and low HF bands.**

### Explanation of the Correct Answer:
- **Beverage Antenna**: This type of antenna is specifically designed for receiving signals, particularly in the Medium Frequency (MF) and low High Frequency (HF) bands. 
- **Directional Characteristics**: The Beverage antenna is a long, low, and horizontal wire that is highly directional, meaning it can effectively pick up signals from a specific direction while rejecting signals from others. This makes it ideal for receiving weak signals, especially in the MF and low HF ranges.

### Why the Other Choices are Incorrect:
- **B: Directional transmitting for low HF bands**: 
  - The Beverage antenna is not typically used for transmitting. Its design is optimized for receiving, not for sending signals. Transmitting requires different antenna characteristics.
  
- **C: Portable direction finding at higher HF frequencies**: 
  - While direction finding is a useful application, the Beverage antenna is not portable and is not designed for higher HF frequencies. It is more effective at lower frequencies and is usually fixed in place.
  
- **D: Portable direction finding at lower HF frequencies**: 
  - Similar to option C, the Beverage antenna is not portable. It is a fixed installation and is not intended for direction finding; its primary function is to receive signals.

### Useful Rules of Thumb:
- **Antenna Length**: The length of a Beverage antenna is typically about 1/4 wavelength of the frequency you want to receive. For example, at 1 MHz (300 meters), the antenna would be approximately 75 meters long.
- **Low to Medium Frequencies**: Beverage antennas are most effective in the MF (300 kHz to 3 MHz) and low HF (3 MHz to 30 MHz) bands, making them suitable for long-distance reception.

In summary, the Beverage antenna is primarily used for directional receiving in the MF and low HF bands, making it a valuable tool for amateur radio operators focused on weak signal reception.