That's nice work hoser ! ,
I play a lot with rubber ducky's, of all types, just for the fun of it, small , put them anywhere and it's for scanning right? Who said the duck has to be on the scanner.
I have the RH77CA antenna and 2 others on remote stands, but all of my remotes are made with the BNC chassis mounts and a 6" jumper to the main coax , 2 have ground planes , one is for the 800 RS rubber duck that sets up on top of my wife's tall brass lamp stand next to the window, 14ft from the scanner using LMR-200, the brass wire's for the shade are the ground plane, I get 5 bars with it on the GRE-300.
The RH77CA is on what I call the duck tester, an 8 legged ground plane for the 800 and 450mhz and that thing works great, about 18ft away using LMR-240.
You may find that after you make it up you will not need to put it outside, I work MilAir with the RH77CA and the other ground base, it's hanging from the ceiling.
Hey I'm a Attic Farmer and most of my big antenna's are up there, so I need something small to play with, so have fun! we are just scanning.
ReCall