Fix windows build

diff --git a/src/Radio/antenna.cxx b/src/Radio/antenna.cxx
index bb5770fb5b5ac709f0bb62c1878cee36df5aa3e9..8a55707d55abad517810b3604648a7bf0c119b87 100644 (file)
--- a/src/Radio/antenna.cxx
+++ b/src/Radio/antenna.cxx
@@ -94,7 +94,7 @@ void FGRadioAntenna::load_NEC_antenna_pattern(string type) {
                //cerr << "head: " << heading << " elev: " << elevation << " gain: " << gain << endl;
                AntennaGain *datapoint = new AntennaGain;
                datapoint->azimuth = heading;
-               datapoint->elevation = 90.0 - fabs(elevation);
+               datapoint->elevation = 90.0 - abs(elevation);
                datapoint->gain = gain;
                _pattern.push_back(datapoint);
        }