Pilot reported there was significant frequency congestion at several airports surrounding U76; all of which use the same frequency; and suggested that the U76 CTAF/UNICOM be changed to alleviate congestion.

Narrative

We experienced significant frequency congestion on the CTAF/UNICOM frequency 122.8 MHz while operating to and at GNG. On a typical flight in this area; frequency congestion is routinely observed because several airports surrounding U76 use the same 122.8 frequency. These airports are U76; GNG (44 miles from U76); JER (62 miles from U76); ONO (80 miles from U76); and MYL (105 miles from U76); with U76 centrally located between them. On this particular day; several aircraft were operating at U76 using the CTAF/UNICOM for communications while in the traffic pattern. There were at least 2 helicopters and 2 fixed wing aircraft in the traffic pattern; some of whom were flying non-standard traffic patterns which required radio transmissions to deconflict. We observed several of these transmissions to be simultaneous as evidenced by the resulting squeal in our headsets. Some of the congesting transmissions came from ONO and JER as well as our required traffic pattern transmissions at GNG. We cannot know which of our transmissions were blocked due to simultaneous transmissions from other airports or which of ours blocked necessary transmissions at U76. Additionally; the U76 advisory weather station transmits its advisories on the same 122.8 MHz; further exacerbating the frequency congestion problem.Person A of the Idaho Division of Aeronautics has recognized this problem and believes the best solution is changing the U76 CTAF/UNICOM because of U76's central location between these airports. Person A has provided two frequencies from which to select and a link to the forms needed to request the change. To date; the city of Mountain Home has failed to acknowledge the hazards associated with the frequency suggestion. Airport personnel says the FAA has not contacted them about the problem so it must not exist. The problem has been raised at a number of U76 Airport committee meetings and attempts have been made to discuss the problem with the airport. The advisory committee stated at one meeting that the frequency change is too expensive without doing any research which would have shown it to have no cost to government-owned airports. U76 should change its CTAF/UNICOM frequency to alleviate congestion at several surrounding airports.