you may have ok results with a decent omni-directional but I doubt it. THose don't seem to work for anything. If you can go to Lowes they have UHF only and you can return them if they have multi-path issues. If you are using a 4221 then they are very directional (about 10 degrees max in my experience) so you shouldn't have multipath problems if you combine them. VHF may be a problem though if you have some of those.