TV-viewer
abutter
adjoiner
beholder
bird-watcher
borderer
bystander
drugstore cowboy
eyewitness
gaper
gazer
gazer-on
girl-watcher
goggler
immediate neighbor
kibitzer
looker
looker-on
neighbor
neighborer
observer
ogler
perceiver
percipient
seer
sidewalk superintendent
spectator
spectatress
spectatrix
tangent
televiewer
television-viewer
video-gazer
viewer
watcher
witness