diff --git a/frontends/stv0910.c b/frontends/stv0910.c
index 2fba226..c1c5941 100644
--- a/frontends/stv0910.c
+++ b/frontends/stv0910.c
@@ -1385,14 +1385,17 @@ static int read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 	}
 	Power /= 5;
 	
-	pBBGain = (465 - Log10x100(Power));
+	pBBGain = (465 - Log10x100(Power)) * 10;
 	
 	if (fe->ops.tuner_ops.get_rf_strength)
 		fe->ops.tuner_ops.get_rf_strength(fe, strength);
 	else
 		*strength = 0;
-
-	*strength += pBBGain * 10;
+	
+	if (pBBGain < *strength)
+		*strength -= pBBGain;
+	else
+		*strength = 0;
 	
 	p->strength.len = 1;
 	p->strength.stat[0].scale = FE_SCALE_DECIBEL;
diff --git a/frontends/stv6111.c b/frontends/stv6111.c
index 984e6eb..89628df 100644
--- a/frontends/stv6111.c
+++ b/frontends/stv6111.c
@@ -707,7 +707,7 @@ static int get_rf_strength(struct dvb_frontend *fe, u16 *st)
 	else if (Gain > 10000)
 		Gain = 10000;
 	
-	*st = Gain;
+	*st = 10000 - Gain;
 
 	return 0;
 }