I also recomend the 4228a. I see the (US) price has dropped $10. It can be had for $40 (US).
15 lbs isn't heavy for an antenna.
I'm not a fan of amps, especially outdoor where yoiu can't get to them. Better yet in a attic (or crawl space) where it is out of the weather and where you can add traps and/or filters for problem local transmitters that might overload the amp.