Problem with antenna in FM circuit simulation using Orcad

hi every body
i was simulating an FM circuit http://www.zen22142.zen.co.uk/Circuits/rf/davidtx.htm
i have a problem in the antenna
shall i make it a load 75ohm
or i shall not but it in the design
i use orcad in simulating
but when i but the antenna as a load the oscillator dies

How do you simulate and attach the antenna? By a 75 ohm resistor? Connected how?

i connected the resistor(75ohm) from the collector
to the ground
is this right?

That is not right. Load must be connected instead of antenna because of impedance matching and power gain.
When simulating it does not matter if you with load resistor also "overload" the battery. In practical circuit there must be a 1n blocking capacitor in series with load.

Hi all,

what's the blocking capcitor for?

The blocking capacitor is used for blocking DC and will only allow AC to pass (if the capacitance is large enough).