I have built a FM Transmitter with Arduino, It is pretty easy.
Here is the code for the Arduino. after Uploading you put a big Antenna to pin 9.
95,85 MHZ is the best frequency to receive the Signal
//Code
//Tonlaenge
int EF;
int EFZ;
int EA;
int DF;
int np;
int p1;
//Tonhoee
int d;
int e;
int g;
int h;
int a;
int Q;
int R;
int Z;
void setup()
{
pinMode(9,OUTPUT);
} // end of setup
void loop() {
EF = 500;
EFZ = 750;
EA = 250;
DF = 1000;
np = 80;
p1 = 700;
d = 297;
e = 330;
g = 396;
h = 495;
a = 440;
Q = 594;
R = 660;
Z = 792;
delay(p1);
tone(9,d);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,g);
delay(EF);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,a);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EF);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EA);
noTone(9);
delay(np);
tone(9,g);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EF);
noTone(9);
delay(np);
// 1 zeilenbruch
tone(9,R);
delay(DF);
noTone(9);
delay(p1);
tone(9,R);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EFZ);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(EF);
noTone(9);
delay(np);
tone(9,a);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EF);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EA);
noTone(9);
delay(np);
tone(9,g);
delay(EFZ);
noTone(9);
delay(np);
tone(9,e);
delay(EA);
noTone(9);
delay(np);
tone(9,e);
delay(EF);
noTone(9);
delay(np);
tone(9,d);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(DF);
noTone(9);
delay(p1);
tone(9,R);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EFZ);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(EF);
noTone(9);
delay(np);
tone(9,a);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EF);
noTone(9);
delay(np);
tone(9,R);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EFZ);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EF);
noTone(9);
delay(np);
tone(9,R);
delay(DF);
noTone(9);
delay(p1);
tone(9,Z);
delay(EF);
noTone(9);
delay(np);
tone(9,Q);
delay(EFZ);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,h);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(EF);
noTone(9);
delay(np);
tone(9,d);
delay(1/4);
noTone(9);
delay(np);
tone(9,a);
delay(EFZ);
noTone(9);
delay(np);
tone(9,g);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EF);
noTone(9);
delay(np);
tone(9,h);
delay(EA);
noTone(9);
delay(np);
tone(9,a);
delay(EA);
noTone(9);
delay(np);
tone(9,g);
delay(EFZ);
noTone(9);
delay(np);
tone(9,e);
delay(EA);
noTone(9);
delay(np);
tone(9,e);
delay(EF);
noTone(9);
delay(np);
tone(9,d);
delay(EF);
noTone(9);
delay(np);
tone(9,g);
delay(DF);
noTone(9);
delay(np);
}