Whistler WS1088 Handheld Digital Scanner Radio Multi-system trucking Easy to use full keyboard New object oriented, menu driven user interface Easily create new objects The complete radio reference USA and Canada database on Micro SD card. Weak signals from distant stations. Reposition for best reception. 2-Way radio reception is line-of-sight. Consider an outdoor antenna; the first 30 feet of elevation makes the most difference. Attenuator in use on weak signals. Check performance with and without attenuator activated,use setting with best reception.Strong signal overload from nearby transmitter.Check performance with and without attenuator activated, use setting with best reception.Loose or defective antenna. Inspect antenna and connectors and correct any problems found.Incorrect modulation mode selected. Ensure that proper modulation mode is selected for the type of system being monitored. If necessary, use the PC Application to change modulation mode