if i remember right there is a tune and load settings inside toward the left side back of radio,,, i had a midnight special with a minute man d1o4 back in the late 70s,, had it in my 1970 monte carlo mounted under the dash,, with a 102 whip on back bumper it was a screamer with skip going,,, had it modded to 40 channels above channel 40,,, hope this helps