My stand is metal and I get weak service. If I hold my arm next to or out of the window it works..

Is there a non expensive booster fix?

Thanks

By inexpensive, you mean less than $300? Sure, there are a few options. The problem is that they all seem to require a fairly significant power source. So unless you have power to your hunting blind, I am not sure you are going to find an inexpensive cell booster than is readily usable in the blind.

So what you may want to try (and maybe waste a small amount of money on) is a passive cell phone antenna. They don't actually add power or boost anything because they are passive. However, they may help bring in signal from outside to inside depending on the setup.
https://itstillworks.com/boost-att-signal-8555362.html

However, in doing more reading, most people think they are a scan and nothing but junk.