I'm going to try out the CM-7777HD Dual. It's on sale for $69.99, down from $89.99. It has the ability to toggle between 17 dB and 30 dB. If it works better than my TVPRAMP1Z, which is 22 dB, then I'll use the TVPRAMP1Z as a backup.
I've heard great things (particularly price/performance) for that little RCA amp.
But if you're looking for a hotter amp, check out Kitz Tech's KT-500 preamp. It has a noise figure below 1 dB and have 36 dB of gain (adjustable). The biggest problem you'll have with it is overload...
The CM-7777 has been available for many years, I've had one on my antenna for 14 years. All they did was combine the CM-7777 (30dB) and the CM-7778 (16dB) into a single unit (CM-7777HD) to streamline the product line. Mine has the mast mount built in, no zip ties, and the connections are underneath, protected a bit from the weather. Works great BTW.
I would be concerned with the zip ties holding up exposed to the sun like that. Every zip tie I have ever used outdoors eventually gets brittle and fails. I might be tempted to use mechanics wire threaded thru the holes, wrapped around the pole, and twisted together instead.