nanderson has excellent, thorough info here. i wanna ad a couple tings, tho.
adcom's tuna, the gft-1a, which was by far the best tuna they ever made, *also* rated as "best sound w/a strong signal", in that s'phile comparo which included the nec t6e. i have one, & its' true - good sound. it beats the nec in all areas - my friend bought a nec, based upon that s'phile article, & we've compared. but, i'm not using it, so anyone wanna make me an offer? ;~) i'm original owner, have the obm, it's in great shape.
so, if the adcom is so good, how come i'm not using it? ;~) well, i happen to tink the tuna i am using competes, in sound & reception, w/the best there is - the onix bwd1 w/soap power supply. besides great specs, this tuna has the sound to match. i had a chance to compare it w/the naim nat-01 - one of the all-time great-sounding tunas, imho, & it gave up little, if anything, to that tuna. it retailed for ~$1800 w/the upgrade p/s, but every once in a great while, ya see 'em used for ~$400-$600. it's an overlooked great tuna. i'm at the western foot of a ~1800'-hi ridge, w/the stations ~75 miles east of me, & w/the help of an antenna performance specialties antenna, i get critical-listening-quality reception on the two quality stations i listen to most. & i listen to a *lot* of fm.
another excellent tuna i'm fortunate to have, is a revox b261. this ting is an unbelievably complicated big-box digitally-synthesized tuna - the polar opposite of the 2-knob analogue onix. it has 20 presets, the ability to program the call letters, etc, for each station, threshold-level settings, fixed & adjustable outputs, the ability to detune in 0.0125 increments (ie: ewe can set it to 89.3125 instead of 89.3). and a bunch of other stuff i can't tink of off the top-o-my-head. i picked this retail-$1500-tuna up for ~$300 at a local used stereo shop here, & it's been dead-reliable for the ~5 years i've owned it. sonics are comparable to the onix, but not as warm - i prefer the warmth the onix offers. so, the revox does admirable duty as the bedroom tuna, w/simple rabbit-ear antenna...
good luck, doug