In SH3 Sensors.cfg will allow you to set the range for both "ImportantRadioContacts" as well as "OpportunityRadioContacts" to whatever range you want. I believe it is the same for SH4 (I can't check now for technical reasons too convoluted to explain). Crank them both up to 3,000 km and you should see lots of contacts within that range. You will have to do that before you start a new patrol tho.
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