Cell tower lease California Valley

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I was proposed by AT&T to put a cell tower on my property in California Valley, CA. Its a very rural area and barely any cell phone service out there. It would be placed in the corner away from the house on the 2.5 acre lot. They asked 500/mo with a 7% annual increase. I came back and asked them for 800 a month and they accepted no questions asked. Now Im thinking the lot is worth way more and I negotiated way too low? Is it too late to ask them for more? How do I find out if this is a hot spot or what its worth without having to pay multiple real estate attorneys?