LF Engineering H-900 antenna
 

I just purchased the LF engineering H-900 active antenna I am using it with the Elecraft K3 radio's sub receiver. I have mounted the antenna in the attic as I live in a condo townhouse and out door antennas are prohibited. Here is what is happening, I switch the gain switch to position my received signal goes down and in some cases disappears. I was under the impression with this switched on the signals would increase?
Thanks in advance for your help
Mike