It matters a lot. As stated in the second post
Originally Posted by kb2vxa
Full length for low band, 18" each for high band, 6" each for UHF and 9" each for 800MHz. ...snip.... Don't expect omnidirectional performance, rabbit ears are slightly directional. It's not a wide band antenna either, that's why 4 different lengths, one for each band.
It's ok if they are close to you, can always adjust them not so much atop a mast outside!