The stacker has low VHF elements that increase its size and weight but most people don't need.
I usually try to dissuade almost everyone from using the 2012 version of the CM7777 as it has way more gain than does its predecessor. I'm not alone, check out what Channelmaster themselves has to say about it at
http://www.channelmasterstore.com/TV..._p/cm-7777.htm
Quote:
WARNING - The CM-7777 is recommended for professional installers only. This amplifier has a high gain output and can result in over amplification if not used in the appropriate scenario. Over amplification can cause issues with a television tuners ability to receive and display some or all channels. An ideal scenario for the CM-7777 is an application where ALL broadcasts towers are 80+ miles from the broadcaster and a splitter is used to distribute to multiple televisions. Just one high power signal or broadcaster that is close in proximity can cause over amplification resulting in the loss of reception. The CM-7777 is a high quality, high gain amplifier and is subject to misuse, less than 1% of the CM-7777's that are returned are actually defective.
Channel Master recommends the CM-7778 amplifier for consumers that do not have the ability to measure or calculate signal levels. In 98% of consumer applications, the CM-7778 is the best choice and will outperform every other professional grade amplifier on the market without having to worry about over driving strong signals.
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