Antenna placement has a lot to do with what Scanner Range setting a person may choose, regardless of scanner model. An antenna mounted outside (on a roof or antenna tower) is more likely to receive a distant transmitter's signals than a scanner placed in the corner of a basement.
Range depends on a lot of things. One issue is "seeing" over the curvature of the Earth. The higher the antennas (both transmitting and receiving), the farther they can see each other. This is why transmitters/repeaters are often on high towers and/or mountains.just curious if you have your antenna up about 25 foot or higher what range on the scanner does it need to be set at i have a sds100 my antenna up about 30foot was just wondering?