frequency=$(zenity --error 2>/dev/null --list --title="Choose the frequency" --column="kHz" --column="Use"144390"APRS US 2m"434900"CubeSatSim"144800"APRS European 2m" 2>/dev/null)"000"
if[ -z "$frequency"];then
if[$frequency=="000"];then
echo"Choose the number for the packet decoding option:"