To find and open the safe in the “Under the Radar” mission of Call of Duty: Black Ops 6, follow these detailed steps:

### Step 1: Locate the Radar Dish
1. **Mission Objectives**: After starting the “Under the Radar” mission, you will be given three objectives. One of them will be to investigate the **Radar Dish**.
2. **Navigation**: Exit the lookout tower and head towards the Radar Dish location to the west.
3. **Arrival**: Once you arrive at the Radar Dish, spot the tower with the spinning dish. There will be a ladder to the left that you need to climb.

### Step 2: Access the Roof
1. **Climbing**: Climb up the ladder to reach the roof of the Radar Dish tower.
2. **Guard Position**: On the roof, look to the right and spot a guard standing next to the spinning dish.
3. **Platform Drop**: Just to the left of the guard is a platform for you to drop down on.

### Step 3: Enter the Room
1. **Drop Down**: Drop down from the platform and enter the room.
2. **Radio and Safe Location**: Right at the start of the room, you’ll spot the radio sitting on a table to the right. The safe is located behind a locked gate to your left.

### Step 4: Solve the Radio Puzzle
1. **Radio Interaction**: Interact with the radio to begin the waveform puzzle.
2. **Frequency Adjustment**: Adjust the frequency and amplitude of the waveform to match the signal.
3. **Safe Code**: Once you’ve matched the signal, the radio will begin to play a repeating string of numbers. These numbers are the safe code.

### Step 5: Open the Safe
1. **Lockpicking**: To open the safe, you’ll need to lockpick the gate. Make sure the guard next to the radio or inside the fenced area is facing you.
2. **Secure Area**: Once inside, you’re in a restricted zone, so grab the safe as fast as you can and get back out.
3. **Safe Location**: The safe will be to your immediate right when entering the fenced area.

### Safe Reward
– **Reward**: You will receive $1000 and potentially earn the SAFE CRACKER achievement if you’ve followed the steps correctly.

By following these steps, you should be able to find and open the safe in the “Under the Radar” mission of Call of Duty: Black Ops 6.