Adding an amp is good bad or indifferent. Adding a better antenna is good bad or indifferent.
There is a lot to be said and done in the ability to improve or not improve earnings.
First off your surrounding partners are huge for making profit.
So buying 400 dollar amps could be stupid or not stupid.
this company has a wide choice
this one is most likely to strong +27db
and too much noise. 3.5 db
it covers 40 to 960 MHz which is okay
https://www.rflambda.com/pdf/lownoiseamplifier/R04M96MSA.pdf
I need to look more as I no longer have the contacts for these that I did in 1992-2006
this one is better
https://www.rflambda.com/pdf/lownoiseamplifier/R02M04GSA.pdf
200 to 4000 mhz
gain 13db
2.5db
Helium amps have to be 2 way aka bi directional, typical wide band LNA's arent capable of sending and receiving simultaneously
And yes, too much of a boost may just give up the fact youre using an amp to the helium community and you will be banned, therefore extensive research ought to be done of the neighboring hexes.
Also i'd have to disagree with you about the antenna on this one phil, a proper sensitive, tuned antenna with the signal to noise ratio of a 1.0:1 to 1.1:1 with a proper, short, low loss cable is critical in helium.