Pro Stick Plus combined with External SMA Filter?

[abcd567]

The external filter will add insertion loss, but it is small (< 2.5 dB), and is easily compensated by the 18 dB LNA (low noise amplifier) built into ProStick.

@dbaker

They have SMA connectors (male and female), pass 980-1150MHz with an impedance of 50ohms and insertion less of <2.5dB.

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From https://www.amazon.com/ADS-B-Dual-1090-Band-Pass-Filter/dp/B010GBQXK8

Description

1090MHz Mode S filter with SMA (female to male) connectors. Designed to reduce interference and significantly improve valid aircraft transponder message rate of ADS-B/Mode S receivers. Passes range 980MHz - 1150MHz. Impedance is 50ohms and insertion loss is <2.5dB.