diff --git a/core/geo_utils.py b/core/geo_utils.py
index ce0cbf2..88a4661 100644
--- a/core/geo_utils.py
+++ b/core/geo_utils.py
@@ -40,11 +40,21 @@ def lat_lon_to_cq_zone(lat, lon):
 
 # Finds out which ITU zone a lat/lon point is in.
 def lat_lon_to_itu_zone(lat, lon):
+    lon = ((lon + 180) % 360) - 180
     for index, row in itu_zone_data.iterrows():
         polygon = Polygon(row["geometry"])
         test_point = Point(lon, lat)
         if polygon.contains(test_point):
             return int(row["name"])
+
+        # Might have problems around the antemeridian, so if we didn't find a match, try offsetting the point by + or -
+        # 360 degrees longitude to try the other side of the Earth
+        if lon < 0:
+            test_point = Point(lon + 360, lat)
+        else:
+            test_point = Point(lon - 360, lat)
+        if polygon.contains(test_point):
+            return int(row["name"])
     return None