hi guys, hoping someone can answer this question for me. i have a grecom psr700 scanner that works great. i have a diamond RH519 antenna and a RS800mhz antenna. the RH519 works great on the 150-174mhz band and decent on the 800 mhz system that i listen to. i am just out of reach of the 800mhz unless i use the RS800 antenna, then i can pick up the signal fairly decent. The RH519 i can pick up the 150-174 band pretty good but im out of range of the 800mhz band. the RS antenna is kinda useless at the 150-174 bands which i knew since that antenna is specifically tuned for the 800 system. my question is this...would it be of any help to use a double duck antenna adapter and use both the RS800 and the RH519 at the same time or would there be some kind of interference? any help would be greatly appreciated. im not new to scanning at all tho i admit to being somewhat new to the different technologies that have to do with antennas. thanks again and hope to hear some good advice from you guys.