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I used a 30cm wire for my 433Mhz transmitter. I used the transmitter (along with HT12E) for my project. It works fine with wire antenna itself.
if (ButtonPressed(0, PINC, 0, 70))
{
while (! (UCSRA & (1 << UDRE)) );
UDR = 0x55;
while (! (UCSRA & (1 << UDRE)) );
UDR = 0b10111001;
}
ISR(USART_RXC_vect)
{
receiveData = UDR;
if(receiveData==0b10111001)
{
PORTB|= (1<<PINB0);
_delay_ms(100);
PORTB^= (1<<PINB0);
}
}