diff --git a/radar_data_reader/core/app_controller.py b/radar_data_reader/core/app_controller.py
index f210e0a..978fce7 100644
--- a/radar_data_reader/core/app_controller.py
+++ b/radar_data_reader/core/app_controller.py
@@ -144,9 +144,18 @@ class AppController:
                 if not profile: raise ValueError(f"CSV profile '{self.view.out_csv_profile_var.get()}' not found.")
                 self.active_export_profiles["csv"] = profile
                 path = (output_dir / basename).with_suffix(".csv")
+                
+                # Determine the delimiter based on the GUI checkbox
+                use_tab_delimiter = self.view.out_csv_use_tab_var.get()
+                delimiter = "\t" if use_tab_delimiter else ","
+                log.info(f"Preparing CSV file with '{delimiter}' as delimiter.")
+
                 fh = open(path, "w", encoding="utf-8", newline="")
                 self.output_file_handles["csv"] = fh
-                self.csv_writers["csv"] = csv.writer(fh)
+                
+                # Create the CSV writer with the chosen delimiter
+                csv_writer = csv.writer(fh, delimiter=delimiter)
+                self.csv_writers["csv"] = csv_writer
                 self.csv_writers["csv"].writerow([f.column_name for f in profile.fields])
             
             if self.view.out_output_json_var.get():
diff --git a/radar_data_reader/gui/main_window.py b/radar_data_reader/gui/main_window.py
index 3fb2435..cfef413 100644
--- a/radar_data_reader/gui/main_window.py
+++ b/radar_data_reader/gui/main_window.py
@@ -67,6 +67,7 @@ class MainWindow(tk.Frame):
         self.out_output_dir_var = tk.StringVar()
         self.out_basename_var = tk.StringVar()
         self.out_output_csv_var = tk.BooleanVar(value=True)
+        self.out_csv_use_tab_var = tk.BooleanVar(value=False) # New variable for tab separator
         self.out_output_json_var = tk.BooleanVar(value=False)
         self.out_csv_profile_var = tk.StringVar()
         self.out_json_profile_var = tk.StringVar()
@@ -148,15 +149,25 @@ class MainWindow(tk.Frame):
         formats_frame = ttk.LabelFrame(parent, text="Output Formats & Profiles")
         formats_frame.grid(row=2, column=0, columnspan=3, sticky="ew", padx=5, pady=5)
         formats_frame.columnconfigure(1, weight=1)
+        formats_frame.columnconfigure(2, weight=1) # Add weight to third column
+
+        # CSV Options
+        csv_options_frame = ttk.Frame(formats_frame)
+        csv_options_frame.grid(row=0, column=0, columnspan=3, sticky="ew")
         
-        ttk.Checkbutton(formats_frame, text="Generate .csv file", variable=self.out_output_csv_var).grid(row=0, column=0, sticky="w", padx=5, pady=2)
-        self.out_csv_profile_combobox = ttk.Combobox(formats_frame, textvariable=self.out_csv_profile_var, state="readonly", width=20)
-        self.out_csv_profile_combobox.grid(row=0, column=1, sticky="w", padx=5)
-        
-        ttk.Checkbutton(formats_frame, text="Generate .json file", variable=self.out_output_json_var).grid(row=1, column=0, sticky="w", padx=5, pady=2)
-        self.out_json_profile_combobox = ttk.Combobox(formats_frame, textvariable=self.out_json_profile_var, state="readonly", width=20)
-        self.out_json_profile_combobox.grid(row=1, column=1, sticky="w", padx=5)
+        ttk.Checkbutton(csv_options_frame, text="Generate .csv file", variable=self.out_output_csv_var).pack(side=tk.LEFT, padx=(5,10))
+        self.out_csv_profile_combobox = ttk.Combobox(csv_options_frame, textvariable=self.out_csv_profile_var, state="readonly", width=20)
+        self.out_csv_profile_combobox.pack(side=tk.LEFT, padx=5)
+        ttk.Checkbutton(csv_options_frame, text="Use Tab Separator", variable=self.out_csv_use_tab_var).pack(side=tk.LEFT, padx=(10,5))
         
+        # JSON Options
+        json_options_frame = ttk.Frame(formats_frame)
+        json_options_frame.grid(row=1, column=0, columnspan=3, sticky="ew")
+
+        ttk.Checkbutton(json_options_frame, text="Generate .json file", variable=self.out_output_json_var).pack(side=tk.LEFT, padx=(5,10))
+        self.out_json_profile_combobox = ttk.Combobox(json_options_frame, textvariable=self.out_json_profile_var, state="readonly", width=20)
+        self.out_json_profile_combobox.pack(side=tk.LEFT, padx=5)
+
         action_frame = ttk.Frame(parent)
         action_frame.grid(row=3, column=0, columnspan=3, pady=(10, 0))
         self.out_process_button = ttk.Button(action_frame, text="Process .out File", command=self.controller.start_out_processing)