Do somebody knows what´s the recommended heigh to install an access point 1242 with external antennas 1728 on a flat area?

Question

Do somebody knows what´s the recommended heigh to install an access point 1242 with external antennas  1728 on a flat area?And for example, if i use aps 3602 the heigh to install is the same?? BEST REGARDS

Answer 1

To determine the required height of an antenna tower over a hypothetically flat, spherical Earth, it's necessary to calculate the effect of the Earth's curvature, and then add a distance equal to 60% of the radius of the First Fresnel Zone. The table below shows the result of these calculations. Values have been rounded up to the nearest foot.
Line of Sight Distance Between Antenna Towers
Height of Tower to Avoid Flat Earth Curvature
Tower Height Required Over Tallest Obstacle In Line-of-Sight to Provide
60% Fresnel Zone Clearance
2.4GHz 802.11b/g
5.8 GHz 802.11a
8 Miles
10 feet
33
25
10 Miles
15 feet
38
30
12 Miles
20 feet
43
35
14 Miles
25 feet
48
40
16 Miles
30 feet
53
45
18 Miles
40 feet
63
55
20 Miles
50 feet
73
65
22 Miles
60 feet
83
75
24 Miles
70 feet
93
85
26 Miles
80 feet
103
95
28 Miles
100 feet
123
115
32 Miles
125 feet
148
140
34 Miles
150 feet
173
165
40 Miles
200 feet
223
215
It can be seen in the table above that a wireless link between two points separated by 26 miles would require an antenna tower with a minimum height of 103 feet for an 802.11b/g radio and 95 feet for an 802.11a radio. In practice the heights would typically be 20 feet higher, or more. This is because the Earth is not smooth and flat and the tower height must be raised to compensate for buildings, trees, hills, or other obstacles. For example, in a suburban setting, with houses and small offices, it may be necessary to add 20 to 40 feet to the tower height to get over the homes, offices, and trees that would be in the line-of-sight between the two towers.