frequency=$(zenity --list --title="Choose the frequency" --column="kHz" --column="Use"144390"APRS US 2m"434900"CubeSatSim"144800"APRS European 2m")
frequency=$(zenity --list --title="Choose the frequency" --column="kHz" --column="Use"144390"APRS US 2m"434900"CubeSatSim"144800"APRS European 2m")"000"