I would have it installed. You may or may not be charged for it. I still don't know what I'll get charged for it, though the CSR that i spoke with when I placed the original order said it would be free. Probably, your best tactic is to tell them you're not getting the new HD channels, and need an upgrade to EA.
I recently had the 1000.4 installed, replacing my 110/119 & 61.6 setup. Installer used the mounting bracket on the roof for the 61.5 to install the 1000.4 (I can't tell if it's the same mast). He did install two struts. All the wind & rain we had in NJ last weekend, and I didn't lose signal...