You can use this module on each site page to have the radius search in a very simple form, with a center point selector, a distance selector, and a free text search for Sobipro.

Here you can test the module, enter any city in the USA and select a radius. This module is free but need the Radius Search Application for Sobipro to work.

Several sites uses this module as entry page !

Radius Search
Application
Compatible with Geocode Factory
Compatibility with map module of Sobipro

Sobipro Radius Search module

Search for
Find entries that have
Center point