Check out the SpinCast feeders. They're close to I-35 on the north side of San Antonio. I've used them for years. The timers are very reliable, and the wire from the solar panel to the battery is now armor-plated so the squirrels don't eat them.
Easy enough to make a feeder with one of their units, a 55-gallon drum and three pieces of pipe for legs. Just leave an aluminum stepladder nearby for refilling.
I'd set up the timer for minimum quantity, a half-hour after first light, maybe noonish, and then again just before sundown.
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