2 Meter Mag-Mount

I thought about trying five different orientations with two matching cookie sheets. The sheets are "WonderBake" brand and well used. They are 13" by 19" with a lip around them. By flipping them upside down, an 11.5" by 17" flat surface can be used.

First I did one cookie sheet with the antenna in the center with the sheet right-side up. This did not perform great, giving an SWR of 4.029 at 160MHz. One theory I have is that the lip moved the tuning up in frequency, as the SWR appears to drop as the frequency goes up.

Next I flipped the cookie sheet upside down and got much better results: 1.797 at 147.400 MHz. This is the configuration I had been using. These results still aren't great, and this is one reason I am looking for a new 2m indoor base antenna.

Next I tried a few combinations with both cookie sheets. The first was the two sheets upside-down pushed together along the long side with the antenna in the middle of the two. This performed a bit better than one, giving a minimum SWR of 1.714 at 146.200 MHz.

The final setup had the two cookie sheets meeting at their corners. I thought this would perform the best as it would give the largest ground plane under the antenna, but I was wrong. It had a minimum SWR of 1.948 at 146.500 MHz.