Yes, you can use two yagis. Not a huge spacing issue due to being opposite polarizations.
I would make sure there is at least 12 inches between them. From: SmarterBroadband Sent: Wednesday, January 13, 2016 5:28 PM To: af@afmug.com Subject: Re: [AFMUG] The perfect antenna for your new 900 MHz 450 So I was wondering. We have hundreds of old M2 Yagi’s left from our old canopy 900 days. Could we use 2 per 450 install, one vertical and one horizontal? How far apart would they need to be? Adam From: Af [mailto:af-boun...@afmug.com] On Behalf Of Gino Villarini Sent: Wednesday, January 13, 2016 6:53 AM To: Animal Farm Subject: [AFMUG] The perfect antenna for your new 900 mhz 450 http://www.m2inc.com/amateur/902-14wlc-880-950-mhz/ 25db gain!