True, theres a 300 ohm to something matching network in there. But at least its a Channel Master build quality internal matching network. That accounts for some positive in my book.
The CM Spartan preamps in general impress me as middle
of the road given the street price. SMD placement and assembly
seems a little rough. The mechanical design of the housing
leaves much to be desired for a unit intended to be mast mounted
IMHO as it isn't sealed and water can easily enter the housing
perimeter via capillary action, pooling in the case bottom.
I'd expect to at least find a conformal coating on the PCB with such
a housing design.
That aside the actual circuit design is better than most in
this class with the claimed performance actually supported by
the component data sheets. I derived a preliminary schematic
after identifying the active devices.
Note the FM trap only functions for the discrete VHF input and
not for the combined UHF-VHF input. Also it appears additional
reduction of the UHF noise figure is possible given the bias
of the BFG67 in the existing design.
I'd be happy to share the schematic with folks here however
either I lack the requisite forum superpowers to attach a file
or doing so isn't supported.