An antenna's gain is what it is and it doesn't change with elevation. Increased elevation just lets the antenna "see" farther. In other words, it moves the radio horizon further out...just as yoiu can see farther from the hilltop than you can from the base of the hill.
Raising the antenna can also lose some coverage in close under the antenna. The main beam could look over some would-be users, depending on its down angle. Dick ----- Original Message ----- From: Chuck Kimball To: [email protected] Sent: 09 August, 2008 09:57 Subject: [Repeater-Builder] Height Gain figure At one point I had read a number for figuring out the gain you get by increasing the height. Of course at the moment I'm unable to locate that. ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of elevation, but it costs me the line loss (300'), did I really gain anything. I'll figure in the line loss, and adjust the hardline to minimize the loss, but I'm looking for the number to compare how much gain (in db) did I get with the increased height. So... Anyone know what number is for gain as a function of height? or know a reference I can look up. Thanks Chuck n0nhj
