I've got a pair of "deer whistles" from the $1 Store...Dollar Tree, etc. THEY WORK! Mounted on the outside edges of the front bumper... Saw approx. 40 deer today...they all scatter...or stop and look....112 miles in 1hr. 31 min. in a 2003 F150... Matt "no fear" of animals or ice.....-2 again this am in the high desert...