During Halloween, I went to a friend's house to spend the night along with 4 other people. In total, there was five of us that were outside after dark when we were done trick-or-treating (we just wanted free candy). Well, we made a haunted house for my friend's, who I will call H, sister. When we were done, we were playing on her play set/ swing set.

 

The play set has a fort-type thing with a slide and under the fort is a little sand pit, next to the sand pit is a swing set and over the swing set is a tunnel. Well, we were all on the ground, just sitting on the swing (there were two swings and one bar thing) and all of a sudden, we hear rustling up in the fort part up next to us. Well, we said "Cut it out Gene," and the rustling stopped. Then, we found out that Gene (not real name, made up for privacy) was INSIDE the house. 

We got scared, so we ran into the house shrieking. When we calmed down, we decided to go on line to find out a way to do our own little paranormal investigation. When we downloaded a ghost radar on H's little sister's iPod touch and we used my friend D's iPod to record our session. We went outside on H's porch and started speaking to whatever was out there. 

We heard nothing but on the radar, it kept picking up activity. When we played back the session, we heard a high-pitched little girl's giggle that sounded like it was coming from my direction, but no one had that kind of giggle. We listened through the rest of the tape with nothing else, but that giggle creeps me out all the time. 

I am wondering though, does anyone have tips on how to do a better, and remember we are teenagers, not professionals, paranormal investigation to gather more information on the ghost. Remember, we don't have much money but we do have a camera, 3 iPod touch's (two are the ones with cameras), and we have limited funds. 

Please help as we are wondering what is in H's backyard?