[meteoestarreja]

In deed, yagi antennas do a pretty good job, however, that's one thing to consider:
They tend to be very directional what means that, if you don't adjust the direction accurately and depending on the RF pattern, you will get a worse result with the yagi than with an omni-directional antenna.

Something like this:


VS



Those images refer to different view/axis, but I think you'll get the ideia.

You could also test different yagi construction and materials, even if it's only for fun/educational

If you want to do that and need some help, just talk to me. I can help you and/or give you an emulator for analysis