Did Antero ask you for a new lease or a modification of an existing lease? Either way, there are some things in common that you’ll want to ask for. First, more money. Lease bonuses in Tyler should be around $3000/acre right now, and modification bonuses start at $200 and go up to about $1000, depending on how badly they want your property and how much property you control. Royalties on a new lease will probably end up at 16-17%, and on a modification you might be able to get a slight bump up from where the royalties currently are. Always get a No Warranty of Title clause, a Hold Harmless clause, a Formation Limit (Marcellus shale only), and Notification of Assignment (so somebody will tell you if the lease gets sold to another company). Good luck, and have fun!