Hi Asaf,
2) They should be place as close to the antenna as possible. Both the series and shunt components are for the possibility that you need to shift the antenna impedance. Have a look at this app-note for more details: http://www.ti.com/litv/pdf/swra161b
3) A spectrum analyzer is essential when developing RF products, so depending on your needs I would highly recommend buying or renting one.
Cheers,
Fredrik
