diff --git a/core/forms.py b/core/forms.py
index ac74392..acb911f 100644
--- a/core/forms.py
+++ b/core/forms.py
@@ -165,6 +165,47 @@ class StrategyForm(RestrictedFormMixin, ModelForm):
         queryset=TradingTime.objects.all(), widget=forms.CheckboxSelectMultiple
     )
 
+    def clean(self):
+        super(StrategyForm, self).clean()
+        entry_signals = self.cleaned_data.get("entry_signals")
+        exit_signals = self.cleaned_data.get("exit_signals")
+        for entry in entry_signals.all():
+            if entry in exit_signals.all():
+                self._errors["entry_signals"] = self.error_class(
+                    [
+                        "You cannot bet against yourself. Do not use the same signal for entry and exit."
+                    ]
+                )
+        for exit in exit_signals.all():
+            if exit in entry_signals.all():
+                self._errors["exit_signals"] = self.error_class(
+                    [
+                        "You cannot bet against yourself. Do not use the same signal for entry and exit."
+                    ]
+                )
+        # Get all the directions for entry and exit signals
+        entries_set = set([x.direction for x in entry_signals.all()])
+        exits_set = set([x.direction for x in exit_signals.all()])
+
+        # Make sure both fields are filled before we check this
+        if entries_set and exits_set:
+            # Combine them into one set
+            check_set = set()
+            check_set.update(entries_set, exits_set)
+
+            # If the length is 1, they are all the same direction
+            if len(check_set) == 1:
+                self._errors["entry_signals"] = self.error_class(
+                    [
+                        "You cannot have entry and exit signals that are the same direction. At least one must be opposing."
+                    ]
+                )
+                self._errors["exit_signals"] = self.error_class(
+                    [
+                        "You cannot have entry and exit signals that are the same direction. At least one must be opposing."
+                    ]
+                )
+
 
 class TradeForm(RestrictedFormMixin, ModelForm):
     class Meta: