try better antenna to enhance tx / rx power to enhance sensitivity / range.
add 2nd antenna on fon2100 & make one connect to external antenna w/ pigtail. having 2 antenna next to each other gave me worse results than 1 antenna. separate them a few feet and they are wonderful
whr-hp-g54 are better all around, i should know as i've got alot of these f*neras to play with.