I have killed many deer over the years with grunt tubes and the only advise i can offer is to learn from trying to call deer in.It will fail more than it works but when it works you will be amazed.Learn from you mistakes and from your success and learn to read the deers body language.When they hear your calling they may not look in you direction but they will always flick their tail( as to say i hear you ).They often walk away like they are not interested only to slip in from another direction when you think they have moved on.When a deer responds to your calling they know right where the calling is coming from.When i used to hunt from treestands the deer would come in to my calling and stop right under my stand and look for the deer they heard calling.It does work and in time you will learn when to call and when not to call.You can do it and good luck!
