Quote:
Most amps are powered next to the antenna...
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That's not true with preamplifiers in my experience.
The preamp mounts close to the antenna. The power supply is designed to mount inside the building, protected from the elements. Power is sent up the coax to the actual preamplifier. Without power, no signal will pass through the amplifier.
Because the goal is to use a separate UHF and VHF antenna, you should have moved the VHF/UHF switch (on the outdoor amplifier unit, under a small cover on the bottom of the unit) to the 'SEPARATE' position. The FM trap switch is not critical, but should be set to 'ON' in most cases. (Even without an antenna connected to the VHF port, you should be able to get signal from the UHF antenna through the amplifier.)
Is the DB8e facing about 140°?
How high is the DB8e above ground?
Are there trees between the antenna and the stations to the SE?
Did you set the tuner to 'AIR' or 'ANTENNA' mode?
Does your TV tuner have support for ATSC (Over the air digital signal format, which is different than the digital format used in cable networks)?
Have you tried the antenna with none of the amplifier parts installed?