diff --git a/API.md b/API.md
index 393c4b9..11081d1 100644
--- a/API.md
+++ b/API.md
@@ -246,6 +246,8 @@ curl -s -X POST http://localhost:5603/api/v1/terrain/los \
   "clearance_m": 11.28,
   "fresnel_radius_m": 11.9,
   "required_clearance_m": 7.14,
+  "fresnel_upper_60pct_m": 36.84,
+  "fresnel_upper_100pct_m": 41.6,
   "fresnel_lower_60pct_m": 22.56,
   "fresnel_lower_100pct_m": 17.8,
   "type": "terrain"
@@ -257,8 +259,8 @@ curl -s -X POST http://localhost:5603/api/v1/terrain/los \
 - `distance_m` по X.
 - `surface_m` как земля/DSM.
 - `path_height_m` как прямая TX-RX.
-- `fresnel_lower_60pct_m` как нижняя граница требуемой свободной зоны.
-- `fresnel_lower_100pct_m` как нижняя граница полной первой зоны Френеля.
+- `fresnel_lower_60pct_m` и `fresnel_upper_60pct_m` как требуемая свободная зона.
+- `fresnel_lower_100pct_m` и `fresnel_upper_100pct_m` как полная первая зона Френеля.
 - точки, где `clearance_m < required_clearance_m`, подсветить как нарушения.
 
 ## Buildings
diff --git a/api/app/models/__pycache__/terrain.cpython-313.pyc b/api/app/models/__pycache__/terrain.cpython-313.pyc
index 4cb4170..b18207c 100644
Binary files a/api/app/models/__pycache__/terrain.cpython-313.pyc and b/api/app/models/__pycache__/terrain.cpython-313.pyc differ
diff --git a/api/app/models/terrain.py b/api/app/models/terrain.py
index b7777a1..c52dace 100644
--- a/api/app/models/terrain.py
+++ b/api/app/models/terrain.py
@@ -70,6 +70,8 @@ class FresnelProfileSample(BaseModel):
     clearance_m: float
     fresnel_radius_m: float
     required_clearance_m: float
+    fresnel_upper_60pct_m: float
+    fresnel_upper_100pct_m: float
     fresnel_lower_60pct_m: float
     fresnel_lower_100pct_m: float
     type: Literal["terrain", "building", "canopy"]
diff --git a/api/app/services/__pycache__/terrain.cpython-313.pyc b/api/app/services/__pycache__/terrain.cpython-313.pyc
index f74b306..af2670c 100644
Binary files a/api/app/services/__pycache__/terrain.cpython-313.pyc and b/api/app/services/__pycache__/terrain.cpython-313.pyc differ
diff --git a/api/app/services/terrain.py b/api/app/services/terrain.py
index 712f68b..73f7bdb 100644
--- a/api/app/services/terrain.py
+++ b/api/app/services/terrain.py
@@ -130,6 +130,8 @@ def los(
             clearance_m=sample.clearance_m,
             fresnel_radius_m=sample.fresnel_radius_m,
             required_clearance_m=sample.required_clearance_m,
+            fresnel_upper_60pct_m=sample.path_height_m + sample.required_clearance_m,
+            fresnel_upper_100pct_m=sample.path_height_m + sample.fresnel_radius_m,
             fresnel_lower_60pct_m=sample.path_height_m - sample.required_clearance_m,
             fresnel_lower_100pct_m=sample.path_height_m - sample.fresnel_radius_m,
             type=sample.obstruction_type,
diff --git a/api/tests/__pycache__/test_api.cpython-313-pytest-9.0.3.pyc b/api/tests/__pycache__/test_api.cpython-313-pytest-9.0.3.pyc
index 7920574..5ba29df 100644
Binary files a/api/tests/__pycache__/test_api.cpython-313-pytest-9.0.3.pyc and b/api/tests/__pycache__/test_api.cpython-313-pytest-9.0.3.pyc differ
diff --git a/api/tests/test_api.py b/api/tests/test_api.py
index 9b4e649..ae13fff 100644
--- a/api/tests/test_api.py
+++ b/api/tests/test_api.py
@@ -86,6 +86,8 @@ def test_los_endpoint_returns_obstruction_summary_fields() -> None:
         "path_height_m",
         "fresnel_radius_m",
         "required_clearance_m",
+        "fresnel_upper_60pct_m",
+        "fresnel_upper_100pct_m",
         "fresnel_lower_60pct_m",
         "fresnel_lower_100pct_m",
     }.issubset(data["fresnel_profile"][0])