However, due to the high cost of running high power commercial broadcasting facilities; decreased listener-ship and increasing competition from net based international broadcast services, many "short wave" services are being shut down leaving the 40 meter band free of other users for amateur radio use.
但是，由于运行高功率商业广播设施的成本高;由于基于网络的国际广播业务的收听率下降和竞争加剧，许多“短波”服务正在关闭，而40米频段的其他用户无法使用业余无线电。