This is the locator outer marker (LOM) for runway 33 at Fort Collins - Loveland Municipal Airport in Colorado. An LOM combines a non-directional beacon or NDB (the tall antenna on the left) and an outer marker transmitter (the Y shaped antenna on the building to the right) at the same location.
This particular NDB identifies as FN and transmits on 400 kHz. It is located just east of Johnson's Corner along the busy I-25 corridor between Denver and Fort Collins. It is located 4.9 NM from the close end of the runway.
This is a closer view of the "top-hat" loading device on the NDB antenna. This device adds capacitance to the antenna circuit to help compensate for using an antenna that is electrically very short at these low frequencies.
This is a closer view of the outer marker antenna and transmitter shack. The outer marker transmits at very low power on 75 MHz. The special antenna creates a teardrop shaped pattern that can only be received when directly overhead.
The purpose of the NDB is to lead aircraft to this point. If the aircraft arrives above the outer marker at the prescribed altitude, it will be in position to intercept the signals from another set of transmitters called the glide slope. The glide slope guides the aircraft to the end of the runway during instrument (IFR) conditions.
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