*Question E9E09:
Which of the following is used to shunt feed a grounded tower at its base?*  

*Correct Answer is  C: Gamma match*  

### AI Response: (may contain errors)  

To shunt feed a grounded tower at its base, the correct choice is the **Gamma match**.

### Explanation:

1. **Gamma Match**:
   - The gamma match is a method used to feed a grounded tower or vertical antenna. It allows for the connection of a coaxial feedline to a grounded element by using a combination of a series capacitor and a shorting bar along the element. This setup provides impedance matching between the feedline and the antenna.
   - The gamma match is particularly useful for grounded towers because it does not require the tower to be insulated from the ground.

2. **Why Other Choices Are Incorrect**:
   - **Double-bazooka match**: 
     - This is a type of broadband dipole antenna, not a matching method for feeding a grounded tower. It is not used for shunt feeding.
   - **Beta or Hairpin Match**:
     - This method is typically used for matching the impedance of a Yagi or other beam antennas, not for shunt feeding a grounded tower. It involves a shorted transmission line stub (hairpin) to adjust the impedance.
   - **All these choices are correct**:
     - This is incorrect because only the gamma match is suitable for shunt feeding a grounded tower.

### Key Points:
- **Gamma Match**: Suitable for shunt feeding grounded towers.
- **Other Methods**: Not applicable for shunt feeding grounded towers.

Understanding these distinctions helps in selecting the appropriate matching technique for specific antenna configurations.