For those of u who are using a very hot VHF receiver like the Ic 910,mine specs at .11 for 20db,I found the ARR preamp mast mount model to have too much gain. I replaced the 78l05 with a 78l033and realigned for best noise figure. I never used the preamp because of this problem.Now when I switch the preamp on and turn the ic 910 ATT on, I can Dig a noisy signal out of the dirt like never before. Marginal copy way down below 1 degree becomes 59 .amazing. Jeff WB8RJY

jeff broughton