I built similar "beer funnels" in my blinds and they do gurgle. It seems loud inside but you can't hear it that well outside. There's a decent chance a deer at 15 yards will hear it, but probably not past 50 or so.
I already have them in other blinds they don't gurgle. I can see how one would, if you had a valve on the bottom of the urinal and once full you dumped the valve. Now with out a valve to just dump fluid, you really shouldn't have enough fluid to fill (seal) the hose and have air slip by the said seal to make it gurgle.
That being said you may here fluid running down the hose to the pvc septic tube, but shouldn't have a gurgle.
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