Does it work as a High Pass Filter ?

I haven't torn one apart, but I suspect it's a simple finely-tuned a tank circuit that shunts specific frequencies to ground (a simpler method than blocking) which would be considered a notch filter vs. a high or low pass filter. In either case, it works very well for me. I live next to a call tower, and due to our proximity, we couldn't get any more than a few channels. Once the filter was placed between the antenna and our distribution amplifier, we jumped from a handful to over 70 channels now available.

what is the rejection (in dB) and what is the insertion loss (in dB)? All traps/filters must have at least some insertion loss, even if it's .5 dB.

With a 4' antenna cord rejection is .1 to .3 and loss is .5 to .8 depending on connection type.

Does this only work for amplified antennas?

Thank you for your question. It works for both amplified and regular antennas, but if your antenna was purchased in 2020 or later it should have a filter built in already.

ASIN	B08HVT59F5
Antenna	Television
AntennaDescription	Television
Brand	Philips
Color	Silver
Colour	Silver
Customer Reviews	3.9 out of 5 stars 5,630 Reviews
Global Trade Identification Number	00030878531955
Impedance	140 Ohms
Item Type Name	Philips LTE Filter for TV Antenna, Filters 4G 5G LTE Signal to Reduce Interference and Pixilation for Clear Digital HD TV Reception, Frequency Range 5-608 MHz, Indoor Outdoor Installation, SDW1520/27
Manufacturer	Philips
Maximum Range	400 Feet
Maximum range	400 Feet
Number of Channels	100
Number of channels	100
UPC	030878531955

Philips LTE Filter for TV Antenna, Filters 4G 5G LTE Signal to Reduce Interference and Pixilation for Clear Digital HD TV Reception, Frequency Range 5-608 MHz, Indoor Outdoor Installation, SDW1520/27

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