UHF versus 27Mhz CB

This is NOT about comparing the relative qualities of UHF and 27Mhz.
But it does explain why I have not been able to contact some truckies on Ch40 UHF.

On a recent trip I camped near a large converted bus motorhome. It displayed a total of 8 (yes eight) antennae mounted on a rail above the cabin. As I studied them the owner emerged and asked if I would like an explanation, which went like this:

FM/AM broadcast band
HF autotune
Next G for phone
Next G for internet
Police band scanner (owner was retired cop)
UHF tuned to a selected channel
UHF on scan
27Mhz CB
He also had a satellite dish for TV!

The owner explained that many truckies are using 27Mhz to isolate themselves from the UHF recreation fraternity. So calling them on UHF40 may get you nowhere.

Next day with a road train hot on my tail I was able to contact him on UHF40 and offer my cooperation for him to pass. It was appreciated. Later I pulled up alongside him at a roadhouse and chatted. I put the 27Mhz question to him and he confirmed it. In fact he said that he also carried 27Mhz but responded to UHF "if it suited him".

So there I had the answer as to why some truckies do not respond on UHF.
They either do not hear you ...... or choose to not hear you!