I haven't followed it very closely, but people have come up with different designs. There are some designs that use reflector rods that, according to computer modeling, would have better VHF performance.
I would think that an outdoor antenna would be much better, if you have aluminum siding.
It's always good to experiment with antenna locations. When I was experimenting with mine outside on the ground right next to the house, it didn't work well for some channels. I guess there were signals bouncing off the house that were coming into the antenna out-of-phase and canceling out the signals from the other direction. But it works great attached to the porch railing.