hot water heater

This weekend was the first time we have stayed at a campground. Turned the water heater on for a few hours then I tried to shower for the first time. I turned the water on, was warm, so did not have to turn the cold on at all. Then as I started to shower the water would turn to cold then warm and back again. 1) should the water be hotter?2) any ideas on why the water temp would flucuate? 

I agree, this is always the problem when someone has these symptoms.  The valves are closed when the handle is perpendicular to the pipe.

I knew that had been mentioned in here and have been meaning to do a search. Mine does the same thing so tomorrow I will check this out because I'll bet I did all open.
have also been meaning to check out TV reception posts. Even with the booster on, I seem to not be getting many if any stations. At the park I am in, others tell me they can pick up lots of local channels but I'm not getting any. However there is a tall camper beside me and everyone says that's the direction of the signal. But since I have not been getting much at other places I've stayed, I'm wondering if I have a loose connection or something. Is there a way to add something that acts as an antenna other thanthe antenna on the roof?,

When our TV reception went to nothing I learned that the light on the antenna amp is also a switch.  Push the light and it goes on and so does the amp.  That is the first place to look if you haven't already.

bTW, I turned that valve on the back of the water heater and now I have really hot water all the time. I think it has pulsed the whole time I've had the camper and even though I knew I had seen something about it in the form, I guess it was the right time to take care of it :-)