desgin of end fed half wave dipole antenna

i am desgin the end fed dipole by using resonace parallel LC circuit for 869MHz but first i uses the equation Xc=Xl and f=1/2pi*sqrtLC and used short air core cylindrical coil and ceramic capacitor and RG58 and whip but i have problem with my calc it didnt resonace at the frequency and my problem is on which way i choose the inductance and the capacitance sorry i am new in desgins and i am struggle so if anyone can help plz