Also bear in mind that there are different types of receivers used that affect range as well.

Typically the smaller RX's that are available ( with exceptions ) are used in park flyers, which spend most of their time close in. These have fairly limited ranges, often down to 500 ft.

You don't want to make the mistake of putting one of these RX's in a large plane, although some of the better Park Flyer RX's rival their bigger brethren.