diff --git a/.txt b/.txt
new file mode 100644
index 0000000..5ed928f
--- /dev/null
+++ b/.txt
@@ -0,0 +1,48 @@
+
+		--==[ Path Profile Analysis ]==--
+
+Transmitter site: Tx
+Site location: 52.1947 North / 2.0959 West
+Ground elevation: 0.00 meters AMSL
+Antenna height: 30.00 meters AGL / 30.00 meters AMSL
+Distance to Rx: 19.89 kilometers
+Azimuth to Rx: 89.69 degrees
+Depression angle to Rx: -0.1701 degrees
+Receiver site: Rx
+Site location: 52.1953 North / 1.8041 West
+Ground elevation: 0.00 meters AMSL
+Antenna height: 2.00 meters AGL / 2.00 meters AMSL
+Distance to Tx: 19.89 kilometers
+Azimuth to Tx: 269.92 degrees
+Depression angle to Tx: -0.0088 degrees
+Longley-Rice path calculation parameters used in this analysis:
+
+Earth's Dielectric Constant: 15.000
+Earth's Conductivity: 0.005 Siemens/meter
+Atmospheric Bending Constant (N-units): 301.000 ppm
+Frequency: 800.000 MHz
+Radio Climate: 5 (Continental Temperate)
+Polarisation: 1 (Vertical)
+Fraction of Situations: 50.0%
+Fraction of Time: 50.0%
+
+
+
+Summary for the link between Tx and Rx:
+
+Free space path loss: 116.50 dB
+Longley-Rice path loss: 170.10 dB
+Attenuation due to terrain shielding: 53.60 dB
+Mode of propagation: 
+Longley-Rice model error number: 0 (No error)
+
+
+
+
+No obstructions to LOS path due to terrain were detected
+
+Antenna at Rx must be raised to at least 83.99 meters AGL
+to clear the first Fresnel zone.
+
+Antenna at Rx must be raised to at least 37.97 meters AGL
+to clear 60% of the first Fresnel zone.
diff --git a/_curvature b/_curvature
new file mode 100644
index 0000000..10238b0
--- /dev/null
+++ b/_curvature
@@ -0,0 +1,351 @@
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diff --git a/_fresnel b/_fresnel
new file mode 100644
index 0000000..dec6472
--- /dev/null
+++ b/_fresnel
@@ -0,0 +1,352 @@
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+19.890 0.000
\ No newline at end of file
diff --git a/_fresnel60 b/_fresnel60
new file mode 100644
index 0000000..46862e3
--- /dev/null
+++ b/_fresnel60
@@ -0,0 +1,352 @@
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diff --git a/_profile b/_profile
new file mode 100644
index 0000000..caa8840
--- /dev/null
+++ b/_profile
@@ -0,0 +1 @@
+19.890 0.000
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diff --git a/_reference b/_reference
new file mode 100644
index 0000000..e7a13e5
--- /dev/null
+++ b/_reference
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\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index f339cc9..3b23a01 100755
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,4 @@
-double version=2.41;
+double version=2.42;
 /****************************************************************************\
 *       Signal Server: Server optimised SPLAT! by Alex Farrant               *
 ******************************************************************************
@@ -24,8 +24,8 @@ double version=2.41;
 /*
 REQUIRES GCC >= 4.7
 90m mode
-g++ -Wall -Ofast -s -lm itwom3.0.cpp models.cpp main.cpp -o signalserver          
-30m HD mode   
+g++ -Wall -Ofast -s -lm itwom3.0.cpp models.cpp main.cpp -o signalserver
+30m HD mode
 g++ -Wall -Ofast -s -lm itwom3.0.cpp models.cpp main.cpp -DHD -o signalserverHD
 */
 
diff --git a/models.cpp b/models.cpp
index f449c17..08f386e 100644
--- a/models.cpp
+++ b/models.cpp
@@ -1,15 +1,15 @@
 /*****************************************************************************
-*  RF propagation models for Signal Server by Alex Farrant, CloudRF.com      *  
-*                   									                     *
+*  RF propagation models for Signal Server by Alex Farrant, CloudRF.com      *
+*                   							     *
 *  This program is free software; you can redistribute it and/or modify it   *
 *  under the terms of the GNU General Public License as published by the     *
 *  Free Software Foundation; either version 2 of the License or any later    *
-*  version.								   								     *
-* 									    									 *
+*  version.								     *
+* 									     *
 *  This program is distributed in the hope that it will useful, but WITHOUT  *
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or     *
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License     *
-*  for more details.													     *
+*  for more details.							     *
 *****************************************************************************/
 
 #include <stdlib.h>
@@ -119,25 +119,34 @@ TxH = Base station height 30 to 200m
 RxH = Mobile station height 1 to 10m
 Distance 1-20km
 modes 1 = URBAN, 2 = SUBURBAN, 3 = OPEN
+http://morse.colorado.edu/~tlen5510/text/classwebch3.html
 */
-	if(f<1500 || f>2000){
-	    printf("Error: COST231 Hata model frequency range 1500-2000MHz\n");
+	if(f<150 || f>2000){
+	    printf("Error: COST231 Hata model frequency range 150-2000MHz\n");
 		return 0;
 	}
 
 	int C = 3; // 3dB for Urban
+	float lRxH = log10(11.75*RxH);
+	float C_H = 3.2*(lRxH*lRxH)-4.97; // Large city (conservative)
+	int c0 = 69.55;
+	int cf = 26.16;
+	if(f>1500){
+	c0=46.3;
+	cf=33.9;
+	}
 	if(mode==2){
-		C = 0; // Suburban, rural
+		C = 0; // Medium city (average)
+		C_H = 8.29*(lRxH*lRxH)-1.1;
 	}
 	if(mode==3){
-		C = -3; // Suburban, rural
+		C = -3; // Small city (Optimistic)
+		C_H = (1.1*log10(f) - 0.7) * RxH - (1.56 * log10(f)) + 0.8;
 	}
-	float lRxH = log10(11.75*RxH);
-	float C_H = 3.2*lRxH*lRxH-4.97;
 	float logf = log10(f);
-    double dbloss = 46.3 + (33.9 * logf) - (13.82 * log10(TxH)) - C_H + (44.9 - 6.55 * log10(TxH)) * log10(d) + C;  
+        double dbloss = c0 + (cf * logf) - (13.82 * log10(TxH)) - C_H + (44.9 - 6.55 * log10(TxH)) * log10(d) + C;  
 	return dbloss;
-}
+	}
 
 double SUIpathLoss(float f,float TxH, float RxH, float d, int mode){
 	/*
@@ -185,12 +194,12 @@ double ECC33pathLoss(float f,float TxH, float RxH, float d, int mode){
 	// MHz to GHz
 	f=f/1000;
 
-	double Gr = 0.759 * RxH - 1.862; // Big city (1)
+	double Gr = 0.759 * RxH - 1.862; // Big city with tall buildings (1)
 	// PL = Afs + Abm - Gb - Gr
 	double Afs = 92.4 + 20 * log10(d) + 20 * log10(f);
 	double Abm = 20.41 + 9.83 * log10(d) + 7.894 * log10(f) + 9.56 * (log10(f) * log10(f));
 	double Gb = log10(TxH/200) * (13.958 + 5.8 * (log10(d) * log10(d)));
-	if(mode>1){ // Medium city
+	if(mode>1){ // Medium city (Europe)
 		Gr = (42.57 + 13.7 * log10(f)) * (log10(RxH) - 0.585);
 	}
 	return Afs+Abm-Gb-Gr;
@@ -202,7 +211,7 @@ double EricssonpathLoss(float f,float TxH, float RxH, float d, int mode){
 		a0=43.2;
 		a1=68.93;
 	}
-	if(mode==1){ // High loss
+	if(mode==3){ // Low loss
 		a0=45.95;
 		a1=100.6;
 	}
diff --git a/signalserver b/signalserver
index 4771501..f23230a 100755
Binary files a/signalserver and b/signalserver differ