Originally Posted by mkaskavitch
-- We're blessed with great coverage for many systems in our state. Living in the City of Denver how important or unimportant is an outdoor antenna? I'll mostly be monitoring public safety/military/aviation.
Since no one addressed this part of your query...
No way to answer this one, unfortunately! So we'll work around the edges to see how it goes.
If you've been scanning for some time, you'll know that everything depends upon your own site location and what it is you're trying to hear. If you're on the first floor of an apartment building, facing the wrong way in a fairly deep 'hole' in the topography, it's a very different situation from being on a hill in a single family home. Understand that nearly all of the public safety agencies here are on digital in 700/800MHz with VERY few hold-outs still using VHF for anything. At those frequencies, line of sight to a transmitter matters more. Being digital, signal quality matters more in any case. Odds are slim that you'd be unlucky enough to live in one of the 'holes' in the area, though. The metro area isn't as flat as it might first appear, but we have towers up on the mountains nearby that deal with that problem pretty well.
On the whole, you'll probably be OK with an indoor antenna if you're reasonably well sited in the Denver area. Aviation (VHF) should be great from DIA and other regional airports, and since there are several sites serving public safety around the metro area on our DTRS system, you should be able to pick up most anything of interest to you from one tower or another. Denver itself is about to move from EDACS to DTRS APCO Phase II (as noted, you'll probably need a new radio for this), but I have not heard if there is any intent to upgrade their transmitter site count or antenna systems as part of the change. There might be someone here who is more familiar with the entire scope of Denver's plan to update their system.