rick1128,
Thanks for the tip. I learned this the hard way a few months ago. I have been trying to keep my helicopter activities concealed from my spouse. (No point in causing a domestic disturbance before its necessary.) I landed in our yard while she was out of town and the next day, the grass in this spot was brown! No fire, as it is short, green grass, but my cover was almost blown! (In case you are wondering, I will eventually let her in on my secret. I figure that if this is the only thing I hide from her, how big a deal can it be?)
RB