What frequency should you contact Denver Center after losing communication near the CORTEZ VOR?

The frequency to contact Denver Center after losing communication near the CORTEZ VOR is 118.575 MHz. This frequency is part of the air traffic control (ATC) centers' network and is commonly used for enroute communications within specific airspace sectors.

When a pilot experiences a communication failure while in the vicinity of a VOR, it is crucial to use the appropriate ATC frequency that corresponds to that area to re-establish contact. In this case, 118.575 MHz is indeed the designated frequency for contacting Denver Center, which manages air traffic above a certain altitude across its assigned airspace, including around the CORTEZ VOR.

The other frequencies listed are used for different purposes. For example, 108.4 MHz is mainly used for VOR navigation, 122.3 MHz is typically utilized for UNICOM (a frequency used at non-towered airports), and 125.4 MHz serves various other ATC functions not related specifically to Denver Center's enroute communication. Understanding the correct usage of communication frequencies is essential for safe and compliant operation in controlled airspace.