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Spectran tests. I don't understand how it works

Today I tested SPECTRAN® V6 RSA250X and Uniden BCT15X radio scanner. 
I was a bit taken aback by the test results. An analog walkie-talkie was listened to at vhf frequencies (146.000 MHz).
The following assemblies took part in the tests:
1) SPECTRAN® V6 RSA250X with BicoLOG® 30100(without amplifier) ​​vs. Uniden bct15x with Sirio sd 1300 un. 
The distance at which they listened: SPECTRAN - 500 meters, UNIDEN - 15000 meters. 

2) SPECTRAN® V6 RSA250X with BicoLOG® 30100(with amplifier) ​​vs. Uniden bct15x with Sirio sd 1300 un
The distance at which they listened: SPECTRAN reached my radio at a distance of 800 meters, UNIDEN - 15000 meters.

3) SPECTRAN® V6 RSA250X with Sirio sd 1300 un vs. Uniden bct15x with Sirio sd 1300 un.
The distance at which they listened: SPECTRAN reached my walkie-talkie at a distance of 700 meters, UNIDEN - 15,000 meters.

4) SPECTRAN® V6 RSA250X with Sirio sd 1300 un(with amplifier) ​​vs. Uniden bct15x with Sirio sd 1300 un.
Result: Spectran not working correctly.

I wonder how a 13+ year old Uniden can give better range results than SPECTRAN.
I really hope that you can explain to me what I'm doing wrong.
 

How should we tell without any screenshots showing settings etc?

moretier has reacted to this post.
moretier

screenshots

Uploaded files:
  • Screenshot-2022-12-19-at-09.40.39.png
  • Screenshot-2022-12-19-at-09.40.48.png
  • Screenshot-2022-12-19-at-09.41.31.png

I still can't see any spectrum graph showing your signal(s).

Should look like attached:

 

Using the FFT offers better control and signal quality:

You might also want to test: https://v6-forum.aaronia.de/forum/topic/script-based-high-quality-iq-fm-audio-demodulator/#postid-2546