wireless with have not only have a slight drop of quality but also add slight compression.

a normal unit like the sennheiser will cost about rm2k+.

dont get it unless u really know what u're doing. setting it up will take a while and u need to work with the sound ppl too. you dont want them to set wireless microphones, etc to your guitar's wireless frequency. alot of other things to consider.

dont get that guitar bug(the link blacktrix posted). quality is a little fuzzy and ive seen people who use it experience problems (fuzz, cracks/pop and tempororily no sound). well maybe it was bad luck, but we guitarist already have enough of gear. the more 'canggih' gears u add in, the more chances of u having technical problems during the show and ruin ur show.

no offence, but a wireless system for just a concert in school??!! spend more time trying to make music that make the crowd jump and spin around, not yourself syiok sendiri up on stage.