[How much does wattage factor into uhf range ?]

Thank you everyone for helping me understand a little better. 
 

C. David Roberts 

WRKL657 

[How much does wattage factor into uhf range ?]

Thank you everyone for helping educate me on this.
Would it be safe to say that open level terrain and/or elevated antennas such as base stations and repeaters  is where higher wattage comes into play as an asset? 

[How much does wattage factor into uhf range ?]

Hi everyone , I am a newbie so don’t beat me up to bad. I have looked all around in the forms hear and elsewhere for this topic but have not found any straight answers . 
 

We use an MXT400 with 6db antenna, MXT115 with 3db antenna and 805g ht (with Nagoya NA771g antenna) to communicate in our heavily wooded flat area. The MXT115 and 805G seem to “reach out” just as well as the MXT400 and I was wondering why the MXT400 doesn’t perform a little better then the smaller radios . I know uhf is line of sight and in our wooded area that’s not far but I would have thought the bigger radio would “burn” through the woods a little better. 
Any advise is much appreciated 

thank you 

WRKL657