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I have been doing this, getting Milwaukee and Madison channels and using the -J to combine them. It works but would rather Plex do this for me. I am running on a Synology NAS and have to use a PC to run the script.
My batch file:
cd C:\XMLTV
#rmdir /S /Q milwaukee
#rmdir /S /Q madison
#TVguide -z switch enabled
zap2xml -z -I -d 14 -u Userid@gmail.com -p mypassword -c milwaukee -o milwaukee.xml
zap2xml -z -I -d 14 -u Userid@gmail.com -p mypassword -c madison -J milwaukee.xml
#Zapit guide no -z switch
#zap2xml -I -d 14 -u Userid@gmail.com -p mypassword -c milwaukee -o milwaukee.xml
#zap2xml -I -d 14 -u Userid@gmail.com -p mypassword -c madison -J milwaukee.xml
del milwaukee.xml
move /Y xmltv.xml Z:\Plex\xmltv.xml