Looking toward future requirements is fine, it's just premature at this point (March of '18). It looks like the Bay area and Sacramento are both scheduled for repack phases 8 & 9 - Jan - May of 2020. You've got two years before your area changes.
It costs us a LOT of money to re-engineer an antenna and to re-work the manufacturing, distribution, marketing, and everything that follows. Given how few Yagi antennas we sell these days compared to everything else (about 0.2% of our gross unit sales last calendar year ), it's my personal opinion that it isn't worth the expense from a financial standpoint. Such a decision is above my pay grade anyway.
It's general practice to put filters in front of any amps so they can remove offending frequencies before IMD has a chance to occur. Post amplification, it's too often too late handle the issue effectively. BTW, the R-S LTE filters disappeared whe R-S filed for their first bankruptcy. I have seen them on ebay off and on since then.
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