i am thinking of creating a multi band ground plane antenna to be installed in my attic for a scanner. one element at approx 82.5 inches for 34ish, another element at 18.25 inches for 154ish, and the third at 6inches for 468ish. (photo 1) due to space limits, the ground plane will have to be at a 90 degree angle to the vertical elements.
question #1 would this work ??
question #2 measuring distance for veritcal elements (photo 2) from the ground plane up or just the element length ?? (gap between elements and ground plane would be about 1/2 inch)
question #3 would i need 3 separate ground planes, one for each band or will only one ground plane for the lowest band be ok ??
question #4 if i made the 154 and 468 elements collinear, would this effect the antenna at all--other than good ??
(photo 3)
question #5 does making these collinear have any effect on their harmonic performance ??
again, this would be in my attic so i can sturdy it up with some dowels or something. hope i made this so people can understand me, just learning my jargin by reading on internet.
any other comments or suggestions will be greatly appreciated
thanks all in advance
....steve
question #1 would this work ??
question #2 measuring distance for veritcal elements (photo 2) from the ground plane up or just the element length ?? (gap between elements and ground plane would be about 1/2 inch)
question #3 would i need 3 separate ground planes, one for each band or will only one ground plane for the lowest band be ok ??
question #4 if i made the 154 and 468 elements collinear, would this effect the antenna at all--other than good ??
(photo 3)
question #5 does making these collinear have any effect on their harmonic performance ??
again, this would be in my attic so i can sturdy it up with some dowels or something. hope i made this so people can understand me, just learning my jargin by reading on internet.
any other comments or suggestions will be greatly appreciated
thanks all in advance
....steve