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app.py

@@ -602,6 +602,40 @@ def choose_best_parsec(cands: List[Dict[str, Any]], mode: str) -> Dict[str, Any]
     best.pop("_card", None)
     return best
 
+
+def infer_mimo_for_5g(model: str, canon_make: str) -> str:
+    """Best-effort MIMO guess for antenna selection (2x2 vs 4x4)."""
+    # If model is unknown, default to 2x2 (safer ordering)
+    if not model or model in {"Not applicable", "Not listed"}:
+        return "2x2"
+
+    # If the model name hints 5G, lean 4x4
+    if "5g" in model.lower() or model.upper().startswith(("R", "E", "S", "IX", "RUTM")):
+        default = "4x4"
+    else:
+        default = "2x2"
+
+    # Use dec2025routers.csv if we can match the model under the same maker family
+    try:
+        pool = df_dec[df_dec["_canon_make"] == canon_make].copy()
+        if pool.empty:
+            return default
+        hit = process.extractOne(norm_text(model), pool["_norm_model"].tolist(), scorer=fuzz.WRatio)
+        if not hit or hit[1] < MATCH_OK:
+            return default
+        row = pool.iloc[int(hit[2])]
+        txt2 = (str(row.get("Antennas (internal/external/both)", "")) + " " + str(row.get("Modem Type", "")) + " " + str(row.get("Special notes",""))).lower()
+        if "4x4" in txt2 or "4 x 4" in txt2 or "4x 4" in txt2:
+            return "4x4"
+        if "2x2" in txt2 or "2 x 2" in txt2:
+            return "2x2"
+        # If modem type includes 5G, lean 4x4
+        if "5g" in txt2 or "nr" in txt2:
+            return "4x4"
+        return default
+    except Exception:
+        return default
+
 def antenna_options_for(router_model: str, tech: str, mimo: str) -> Dict[str, Any]:
     q_stationary = f"{router_model} {tech} {mimo} omni stationary pole wall fixed site Parsec"
     q_vehicle = f"{router_model} {tech} {mimo} omni vehicle mobile magnetic through-bolt Parsec"