I traveled out Highway 94 to the county line and back up through Mt. Laguna and Julian before coming back to the city and made notes as I could on the systems ... (I'll use the names of the sites listed here)
I have a few updates for the database

Since I'm a data geek, I went and correlated the info I found with what I could find in the FCC databases so I'll post 'em both. I also found some conventional 800 frequencies listed on the same towers that I'm posting as well ...
Also - RCS South works great all the way to Potrero / Tecate ... Which SO office patrols 94 along that section? Lemon Grove? ANYWAYS ...
System Types
YF = Trunked public safety & special emergency (national plan)
YP = Trunked public safety & special emergency
GF = Conventional public safety & special emergency
GP = Conventional public safety & special emergency
Campo
862.2000 - control
860.2000 - voice
- FCC Info (Campo Graves - .2km S of Campo, CA)
Site location - 32.6012, -116.4775
856.2000 - WPJT454 (Type: YF)
860.2000
862.2000
863.1500
857.2500 - WPKF897 (Type: GP)
862.1500 - control
859.2000 - voice
861.1500 - voice
- FCC Info (White Star - 1.6km SW of Boulevard, CA)
Site Location - 32.6481, -116.3173
858.2000 - WPJT454 (Type: YP)
859.2000
861.1500
862.1500
856.2500 - WPKF897 (Type: GP)
866.9500 - WPKM695 (Type: GF)
861.2000 - control
857.0750 - voice (may be a typo)
857.1750 - voice
858.1750 - voice
863.0500 - voice
867.0500 - voice
- FCC Info (Hendrix Peak - 8km E of Jacumba, CA)
Site Location - 32.6331, -116.1017
856.1750 - WPKB641 (Type: YP)
857.1750
858.1750
861.2000
863.0500 - WPYW250 (Type: YP)
867.0500 - WPYW284 (Type: YF)
860.1000 - WPKA531 (Type: GP)
Site Location - 32.9853, -115.7069 with same license
856.1750 - WPKB641 (Type: YP)
857.1750
858.1750
861.2000
867.7250 - control
860.2250 - voice
867.2250 - voice
- FCC Info (Mt. Empire - 11km N of Campo, CA)
Site Location - 32.7353, -116.4936
860.2250 - WPMT504 (Type: YF)
866.2250
867.2250
867.7250
859.1000 - WPKK673 (Type: GP)
867.9500 - control
865.1500 - voice
866.0875 - voice
866.5750 - voice
868.4375 - voice
- FCC Info (Cuyamaca Peak - 10km N of Descanso, CA)
Site Location - 32.9470, -116.6067
858.2000 - WPLW597 (Type: YF)
865.1500
866.0875
866.5750
867.5625
867.9500
868.3750
868.4375
860.2000 - control
857.0750 - voice
858.0500 - voice
859.0500 - voice
859.0750 - voice
861.0500 - voice
- FCC Info (1698 I St., Brawley, CA)
Site Location - 32.9746, -115.5096
856.0750 - WQAI446 (Type: YP)
857.0750
858.0500
859.0500
859.0750
860.2000
861.0500
862.0500
863.1000
864.2500
868.5500 - control
862.0000 - voice
866.3000 - voice
867.9750 - voice
- FCC Info (North Peak - 18km N of Descanso, CA)
Site Location - 33.0067, -116.5861
862.0000 - WPMT497 (Type: YF)
866.3000
867.4750
867.9750
868.5500
868.9250
860.1500 - WPZZ334 (Type: YP)
866.9500 - WPKM705 (Type: GF)
- Mike